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Overview

TeXML is an XML based data structure used by Telnyx to build quick applications to be associated with your Telnyx phone numbers. When a call comes into one of your Telnyx Numbers, Telnyx makes an HTTP request to the URL endpoint you configured for that number. The endpoint will contain instructions telling Telnyx what to do next with the call.

Responses to the HTTP request are in an XML format that we call TeXML. TeXML allows you to specify instructions in your file using simple commands called verbs. TeXML Translator starts at the top of your TeXML file and executes your TeXML commands sequentially in the order they are arranged in the file.

| Overview | Dial | Conference | Enqueue | Gather | Leave | Hangup | Pause | Play | Record | Redirect |Reject | Say | Stream | Suppression | Transcription |


How TeXML translator works

Check out our TeXML Setup Guide to get started on a simple TeXML text-to-speech application.

When a call is received by one of your Telnyx phone numbers, Telnyx lookup the URL endpoint you configured for that number and make an HTTP request to it. The URL endpoint then responds to the request with a TeXML file that instructs what to do next in the call. TeXML files have a standard .xml file extension.

Telnyx will read the instructions in the TeXML file, from top to bottom, and execute all the verbs/commands in order.

Outbound calls started via the TeXML Translator work the same way. When you start an outbound call, you also pass a link to a TeXML file. Telnyx will make a request to this file to determine how it should proceed with the call.

While a single TeXML document is executed at a time, many documents can be linked together and generated dynamically to create complex applications to fit any need.

TeXML syntax

TeXML Translator is XML-based and consists of the following elements:

  • <Response> element -- tag defining the body of the TeXML document
  • verb -- an XML tag denoting the action that you want Telnyx to take
  • noun -- the item for the action specified in the associated verb

Here is a simple TeXML file containing an example of a verb and noun used together:

<?xml version="1.0" encoding="UTF-8"?>

<!-- TeXML files must contain the Response element -->
<Response>
<!-- Say and Dial are Verbs -->
<Say>Thank you for calling Telnyx. Please hold.</Say>
<Dial>
<!-- Number is a Dial Noun -->
<Number>+13129457420</Number>
</Dial>
</Response>

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Dynamic parameters

When creating a TeXML set of instructions you can make use of Mustache Templates to generate instructions dynamically at runtime.

Inserting dynamic content

You can make use of Mustache Dynamic templating to insert content into your TeXML instructions through HTTP request parameters in the webhook url we use to fetch your TeXML set of instructions. For example, you could create a TeXML set of instructions that calls a number that is set until the HTTP request is made to fetch your TeXML instructions.

You first create your TeXML instructions using Mustache Templating and set the {{PhoneNumber}} as a variable like this

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Number>{{PhoneNumber}}</Number>
</Dial>
</Response>

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The phone number can now be replaced at runtime by setting your TeXML webhook url to have PhoneNumber as a parameter.

curl -X POST https://api.telnyx.com/v2/texml/calls/{connection_id} \
--data-urlencode "To=+13121230000" \
--data-urlencode "From=+13120001234" \
--data-urlencode "Url=https://www.example.com/texml.xml?PhoneNumber=+18771234567" \
--data-urlencode "StatusCallback=https://www.example.com/statuscallback-listener" \
--header "Authorization: Bearer APIAuthKey_fromPortal"

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The request parameters set by Telnyx, i.e. CallSid, From and To are also available for the Mustache Template. The list of the parameters for each of the callback can be found on our developer documentation page .

Iterate through lists

You can set arrays as parameters in your TeXML webhook url and let Mustache Template handle them. If for example you want the dial command to have two numbers you could add a Numbers list parameter to your callback Url.

curl -X POST https://api.telnyx.com/v2/texml/calls/{connection_id} \
--data-urlencode "To=+13121230000" \
--data-urlencode "From=+13120001234" \
--data-urlencode "Url=https://www.example.com/texml.xml?PhoneNumbers[]=+18771234567&PhoneNumbers[]=+18771234568" \
--data-urlencode "StatusCallback=https://www.example.com/statuscallback-listener" \
--header "Authorization: Bearer APIAuthKey_fromPortal"

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Then you can handle the PhoneNumbers parameter in the TeXML instructions using the following syntax.

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
{{#PhoneNumbers}}
<Number>{{.}}</Number>
{{/PhoneNumbers}}
</Dial>
</Response>

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This will end up being parsed as

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Number>+18771234567</Number>
<Number>+18771234568</Number>
</Dial>
</Response>

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Render conditional content

Conditional content is supported by using if/else statements in the TeXML instructions. You could define a set of instructions to dial an specific number depending on From parameter present in the HTTP request.

<?xml version="1.0" encoding="UTF-8"?>
<Response>
{{#if From == +18771234567}}
<Dial>
<Number>+18771234568</Number>
</Dial>
{{#elseif From == +18771234568}}
<Dial>
<Number>+18771234567</Number>
</Dial>
{{#else}}
<Say>No valid number is present</Say>
{{/if}}
</Response>

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Supported operators are ==, != and no operator for checking if the parameter value is not null.

Response

The baseline of TeXML files is the <Response> tag.

All verbs in a TeXML file must be placed within a single parent <Response> element, and each file can only have a single one.

Verbs

A verb identifies the action to take.

When using Verbs one instruction must completed before the next one is executed. Verbs may have optional TeXML attributes that override the flow of execution, allowing you customize the verb behavior.

All verbs are case sensitive, so <Dial> and <dial> are not interchangeable.

Voice verbs

The following verbs cause the specified action to take place during the call:

VERBACTION
<Dial>Initiates a call to a phone or SIP number
<Gather>Collects DTMF input from the caller or called party
<Hangup>Disconnects the call
<Pause>Waits silently for a specified number of seconds
<Play>Plays an MP3 or WAV audio file
<Record>Records and saves the audio in the call
<Redirect>Transfers control of the call to another TeXML application
<Refer>SIP refers (transfers) the call towards SIP infrastructure
<Reject>Rejects the call
<Say>Executes a Text-to-Speech instruction

Nouns

A noun is what the verb uses to complete an action and is placed inside a verb element. A noun can be the text that is read in a call or other TeXML elements that represent the action, such as Number to dial or a SIP URI to transfer the call to.

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Sip>sip:[email protected]</Sip>
</Dial>
</Response>

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Each verb has its own set of nouns. See the documentation for a specific verb for more details.


Additional request parameters

Each time Telnyx makes a request to your application to fetch new TeXML, additional parameters with information about the call will be sent with the request to your URL.

PARAMETERDESCRIPTION
CallSidA unique identifier for this call, generated by Telnyx.
FromThe phone number of the party that initiated the call. Phone numbers are formatted with a '+' and country code, e.g. +16175551212 E.164 format.
ToThe phone number of the called party. Phone numbers are formatted with a '+' and country code, e.g. +16175551212 E.164 format.

Data formats

Dates and times

All dates and times in requests to and from TeXML files follow Telnyx API conventions: UTC, and presented in RFC 2822 format.

Phone numbers

All numbers in requests to or from TeXML files follow Telnyx API conventions: E.164 format. Numbers in this format start with a plus sign ("+") and the country code.

SIP URIs follow Telnyx SIP Trunking and SIP Credentials conventions: sip:[email protected]

Dial

The <Dial> verb transfers an existing call to another destination. <Dial> will end this new call if: the called party does not answer, the number does not exist, or Telnyx receives a busy signal.

Verb Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
actionOptional URL where TeXML will make a request to when the <Dial> call ends to retrieve a new set of TeXML instructions to continue the call flow.
methodHTTP request type used to retrieve the next set of instructions.GET, POSTPOST
callerIdCaller ID that must be a valid E.164 format number.
fromDisplayNameThe fromDisplayName string to be used as the caller id name (SIP From Display Name) presented to the destination. The string should have a maximum of 128 characters, containing only letters, numbers, spaces, and -_~!.+ special characters. If ommited, the display name will be the same as the number in the callerId field.
hangupOnStarThe hangupOnStar attribute lets the initial caller hang up on the called party by pressing the '*' key on their phone. Does not apply for the Conference noun.true, falsefalse
recordThe record attribute lets you record both legs of a call within the associated <Dial> verb. It works with the <Number> and <Sip> nouns only. If you want to record the conference, please use record attribute on <Conference> noun. Recordings are available in two options: mono-channel or dual-channel.do-not-record, record-from-answer, record-from-ringing, record-from-answer-dual, record-from-ringing-dualdo-not-record
recordMaxLengthDefines the maximum length for the recording in seconds.0-14400, 0 for infinite0
recordingStatusCallbackOptional URL that tells Telnyx where to make its GET or POST request when the recording is available.
recordingStatusCallbackMethodHTTP request type used for recordingStatusCallback.GET, POSTPOST
recordingStatusCallbackEventThe recording events for which Telnyx should a webhook on. Multiple events are separated by a space.in-progress, completed, absentcompleted
recordingTimeoutThe number of seconds that Telnyx will wait for the recording to be stopped if silence is detected. The timer only starts when the speech is detected. Please note that the transcription is used to detect silence and the related charge will be applied.Any integer greater than 0. 0 for infinite0
timeLimitSets the maximum duration in seconds of the call created by <Dial>.60 - 14,40014,400 (4 hours)
timeoutSets the maximum time in seconds that Telnyx will wait for the dialed party to answer.5 - 12030
ringToneThe ringback tone played back to the caller.at,au,bg,br,be,ch,cl,cn,cz,de,dk,ee,es,fi,fr,gr,hu,il,in,it,lt,jp,mx,my,nl,no,nz,ph,pl,pt,ru,se,sg,th,uk,us,us-old,tw,ve,zaus

Nouns

NOUNDESCRIPTIONOPTIONAL ATTRIBUTES
<Number>E.164 phone number.method, sendDigits, statusCallback, statusCallbackEvent, statusCallbackMethod
<Sip>SIP URI.method, password, statusCallback, statusCallbackEvent, statusCallbackMethod, url, username
<Queue>queue namemethod, url

Send custom headers by appending them to the SIP URI -- just as you'd pass headers in a URI over HTTP. For example:

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Sip>
sip:[email protected]?x-mycustomheader=foo&amp;x-myotherheader=bar
</Sip>
</Dial>
</Response>

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Noun attributes

<Number> and <Sip> Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
statusCallbackA URL for Telnyx to send webhook requests to on each event specified in the statusCallbackEvent attribute for outbound calls only. Inbound Status Callback events can be configured for TeXML the connection settings in the Mission Control Portal.
statusCallbackEventThe call events for which Telnyx should send a webhook. Multiple events are separated by a space.initiated, ringing, answered, amd, dtmf, completedcompleted
statusCallbackMethodHTTP request type Telnyx should use when requesting the statusCallback URL.GET, POSTPOST
urlOptional URL to another TeXML document that can contain <Gather> and <Hangup> verbs so that the called party can chose to take an action on the incoming call before the two parties are connected. The callee will continue to hear ringback while the url document is executed.
methodHTTP request type used for url.GET, POSTPOST
machineDetectionEnables Answering Machine Detection. Note: add amd event type to statusCallbackEvent list to receive the detection result webhook.Enable, Disable, DetectMessageEndDisable
detectionModeSets the Answering Detection mode.Regular, PremiumRegular
machineDetectionTimeoutMaximum timeout threshold for overall detection, in miliseconds.500 - 60000

<Number> Only Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
sendDigitsDigits (DTMF tones) to be automatically applied when the call is answered. Use w for 0.5s of silence.Any digits

<Sip> Only Attributes

ATTRIBUTEDESCRIPTION
usernameUsername for SIP authenticationnone
passwordPassword for SIP authenticationnone

<Queue> Attributes

ATTRIBUTEDESCRIPTION
methodHTTP request type used for url.GET, POSTPOST
urlOptional URL to another TeXML document that can contain <Play>, <Say>, <Gather>, <Pause> and <Redirect> verbs. Document will be executed on the queued call before bridging the calls.

Simultaneous dialing

You can use multiple <Number> and <Sip>nouns within a <Dial> verb to dial multiple phone numbers and SIP addresses at the same time. The first person to answer the call will be connected to the caller, while the rest of the call attempts are hung up:

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Number>+18775551212</Number>
<Sip>sip:[email protected]</Sip>
<Number>+18771234567</Number>
</Dial>
</Response>

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Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial action="/nextinstructions.php" callerId="+13120001234">+19999999999</Dial>
</Response>

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<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial action="/nextinstructions.php" callerId="+13120001234">
<Number statusCallback="https://foo.com/my_call_stats" statusCallbackEvent="initiated ringing answered completed">+19999999999</Number>
</Dial>
</Response>

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<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial action="/nextinstructions.php" callerId="+13120001234" hangupOnStar="true">
<Sip statusCallback="https://foo.com/my_sip_call_stats" statusCallbackEvent="initiated">sip:[email protected]</Sip>
</Dial>
</Response>
<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial action="/nextinstructions.php" callerId="+13120001234">
<Number statusCallback="https://foo.com/my_call_stats" statusCallbackEvent="initiated ringing answered completed amd" machineDetection="Enable" detectionMode="Regular">+19999999999</Number>
</Dial>
</Response>

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<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Queue url="/before_bridge_action">TestQueue</Queue>
</Dial>
</Response>

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Expected callbacks

If action is set the following callback can be expected. when the call is completed. The new set of instructions can be sent as a response to it.

{
"AccountSid" : "19a75cea-02c6-4b9a-84fa-c9bc8341feb8",
"AnsweredTime" : "2023-09-06T09:05:14.860713Z",
"CallLegId" : "7d87c352-4c94-11ee-99f7-02420a0daa69",
"CallSessionId" : "7bf6178c-4c94-11ee-b679-02420aef02a0",
"CallSid" : "v3:viLNGyAMjOw6H0AAmA3_CL4rbzYWgahKGqeoZ0Eu_TUYPeWs5w3z6w",
"CallSidLegacy" : "v3:viLNGyAMjOw6H0AAmA3_CL4rbzYWgahKGqeoZ0Eu_TUYPeWs5w3z6w",
"ConnectionId" : "2034058542482196149",
"DataLocality" : "USA",
"DialCallDuration" : "11",
"DialCallSid" : "v3:t7KEildpy-HskSZeY78-WjFFcJMAaopsPfnkaH2J3NcByeTzgfVS1A",
"DialCallSidLegacy" : "v3:t7KEildpy-HskSZeY78-WjFFcJMAaopsPfnkaH2J3NcByeTzgfVS1A",
"DialCallStatus" : "completed | busy | no-answer | failed",
"EndTime" : "2023-09-06T09:05:26.720715Z",
"From" : "+13122010094",
"OccurredAt" : "2023-09-06T09:05:26.720715Z",
"OrganizationId" : "19a75cea-02c6-4b9a-84fa-c9bc8341feb8",
"StartTime" : "2023-09-06T09:05:14.080710Z",
"To" : "+12029925624",
"UserId" : "19a75cea-02c6-4b9a-84fa-c9bc8341feb8",
}

If statusCallbackEvent are set you can expect the following webhooks.

initiated

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallStatus": "initiated",
"CallbackSource": "call-progress-events",
"From": "+18445931290",
"ParentCallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"ParentCallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"SequenceNumber": "0",
"Timestamp": "2021-04-28 21:51:13.591099Z",
"To": "+13122010055"
}

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ringing

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallStatus": "ringing",
"CallbackSource": "call-progress-events",
"From": "+18445931290",
"ParentCallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"ParentCallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"SequenceNumber": "1",
"Timestamp": "2021-04-28 21:51:13.591107Z",
"To": "+13122010055"
}

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in-progress

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallStatus": "in-progress",
"CallbackSource": "call-progress-events",
"From": "+18445931290",
"ParentCallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"ParentCallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"SequenceNumber": "2",
"Timestamp": "2021-04-28 21:51:15.532975Z",
"To": "+13122010055"
}

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completed

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallDuration": "2",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallStatus": "completed",
"CallbackSource": "call-progress-events",
"From": "+18445931290",
"HangupSource": "",
"ParentCallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"ParentCallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"RecordingDuration": "5",
"RecordingUrl": "https://recording.com/your-recording-url",
"SequenceNumber": "3",
"Timestamp": "2021-04-28 21:51:18.731479Z",
"To": "+13122010055"
}

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amd

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"AnsweredBy": "machine_start|human|fax|machine_end_beep|machine_end_other|unknown",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"MachineDetectionDuration": "23357"
}

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If recordingStatusCallbackEvent are set you can expect the following webhooks.

in-progress

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"CallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"From": "[email protected]",
"RecordingChannels": "1",
"RecordingSource": "DialVerb",
"RecordingStatus": "in-progress",
"To": "+12132045020"
}

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completed

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"CallSidLegacy": "v2:qiaymU9Ij90xJRRkYGWHOIx_41EVJPrzlny2zC67hwL1wVIUnnMrqQ",
"From": "[email protected]",
"RecordingChannels": "1",
"RecordingDuration": "5",
"RecordingSid": "35094891-3290-4142-b2c2-b2eda57534cf",
"RecordingSource": "DialVerb",
"RecordingStatus": "completed",
"RecordingUrl": "https://recording.com/your-recording-url",
"To": "+12132045020"
}

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Status callback HTTP attributes

The attributes contained in the statusCallback request to your URL.

ATTRIBUTEDESCRIPTION
AccountSidA unique identifier for the account generating this call.
CallSidA unique identifier for this call, generated by Telnyx.
ParentCallSidA unique identifier for the parent call.
CallStatusA descriptive status for the call. The value is one of initiated, ringing, in-progress, completed, busy or canceled.
TimestampThe timestamp when the event was fired, given as UTC in RFC 2822 format.
CallbackSourceA string that describes the source of the webhook. This is provided to help disambiguate why the webhook was made. On Status Callbacks, this value is always call-progress-events.
FromThe outbound caller number.
ToThe inbound callee number.
RecordingDurationRecording duration in seconds.
RecordingUrlUrl where the recording can be downloaded from.
RecordingSidA unique identifier for the recording, generated by Telnyx.
RecordingChannels1 for mono-channel, 2 for dual-channel
RecordingStatusThe staus for the recording. The value is one of in-progress, completed or absent.
SequenceNumberA sequence number ordering the multiple callbacks received. First callback has the lowest, last callback the highest.

Conference

The <Dial> verb's <Conference> noun allows you to connect to a conference room. Much like how the <Number> noun allows you to connect to another phone number, the <Conference> noun allows you to connect to a named conference room and talk with the other callers who have also connected to that room. Conference is commonly used as a container for calls when implementing hold, transfer, and barge. If the specified conference name does not exist, a new conference will be created. More <Conference> attributes are coming soon.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
beepSpecify whether a notification beep is played to the conference when a participant joins or leaves the conference. The participant joining the conference will never hear a beep.true, false, onEnter, onExittrue
mutedSpecify whether a participant is muted or not.true, falsefalse
startConferenceOnEnterStart the conference when a participant joins. If this is false and the participant joins a conference that has not started, they are muted and hear background music until a participant joins where startConferenceOnEnter is true. This is useful for implementing moderated conferences.true, falsetrue
endConferenceOnExitIf a participant has this attribute set to true, then when that participant leaves, the conference ends and all other participants drop out. This is useful for implementing moderated conferences that bridge two calls and allow either call leg to continue executing TexML if the other hangs up.true, falsefalse
statusCallbackA URL for Telnyx to send webhook requests to on each event specified in the statusCallbackEvent attribute.
statusCallbackEventThe conference events for which Telnyx should a webhook on. Multiple events are separated by a space.start, end, join, leave, speakerNone
statusCallbackMethodHTTP request type Telnyx should use when requesting the statusCallback URL.GET, POSTPOST
recordThe record attribute lets you record entire conference. When set to record-from-start, recording begins immediately after conference starts.record-from-start, do-not-recorddo-not-record
recordBeepIf enabled, a beep sound will be played at the start of a recording.true, falsetrue
recordingStatusCallbackOptional URL that tells Telnyx where to make its GET or POST request when the recording is available.
recordingStatusCallbackEventThe recording events for which Telnyx should a webhook on. Multiple events are separated by a space.in-progress, completed, absentcompleted
recordingStatusCallbackMethodHTTP request type used for recordingStatusCallback.GET, POSTPOST
recordingTimeoutThe number of seconds that Telnyx will wait for the recording to be stopped if silence is detected. The timer only starts when the speech is detected. Please note that the transcription is used to detect silence and the related charge will be applied.Any integer greater than 0. 0 for infinite0
trimWhether to trim any leading and trailing silence from the recording.trim-silence, do-not-trimtrim-silence
waitUrlA URL to an MP3 or WAV file that should be used for the conference's hold music before the conference starts. The URL can also return an XML document with instructions that will be executed while the call is waiting for the conference to start.

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Dial>
<Conference>Room 1234</Conference>
</Dial>
</Response>

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Expected callbacks

If statusCallbackEvent are set you can expect the following webhooks.

join

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:r3Cj9j-Hx7NAZETtYpdgktVUYKhsc8D1mSmzY8_6r4HHZYViWIs6Fw",
"CallSidLegacy": "v2:r3Cj9j-Hx7NAZETtYpdgktVUYKhsc8D1mSmzY8_6r4HHZYViWIs6Fw",
"ConferenceSid": "58b4eda9-03de-4bee-9178-d0e10d83e519",
"FriendlyName": "Room 1234",
"From": "[email protected]",
"SequenceNumber": "1",
"StatusCallbackEvent": "participant-join",
"Timestamp": "2021-04-28 22:51:29.993535Z",
"To": "+12132045020"
}

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leave

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:r3Cj9j-Hx7NAZETtYpdgktVUYKhsc8D1mSmzY8_6r4HHZYViWIs6Fw",
"CallSidLegacy": "v2:r3Cj9j-Hx7NAZETtYpdgktVUYKhsc8D1mSmzY8_6r4HHZYViWIs6Fw",
"ConferenceSid": "58b4eda9-03de-4bee-9178-d0e10d83e519",
"FriendlyName": "Room 1234",
"From": "[email protected]",
"SequenceNumber": "3",
"StatusCallbackEvent": "participant-leave",
"Timestamp": "2021-04-28 22:51:47.114479Z",
"To": "+12132045020"
}

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end

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:0YXD2QVLtba0UDTe3k6H9gEsAEs4qRLsuy6u_zoS364PKR6DApuKuw",
"CallSidLegacy": "v2:0YXD2QVLtba0UDTe3k6H9gEsAEs4qRLsuy6u_zoS364PKR6DApuKuw",
"ConferenceSid": "58b4eda9-03de-4bee-9178-d0e10d83e519",
"FriendlyName": "Room 1235",
"From": "[email protected]",
"SequenceNumber": "4",
"StatusCallbackEvent": "conference-end",
"Timestamp": "2021-04-28 22:51:51.480853Z",
"To": "+12132045020"
}

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speaker

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid": "v2:0YXD2QVLtba0UDTe3k6H9gEsAEs4qRLsuy6u_zoS364PKR6DApuKuw",
"CallSidLegacy": "v2:0YXD2QVLtba0UDTe3k6H9gEsAEs4qRLsuy6u_zoS364PKR6DApuKuw",
"ConferenceSid": "58b4eda9-03de-4bee-9178-d0e10d83e519",
"FriendlyName": "Room 1235",
"From": "[email protected]",
"SequenceNumber": "5",
"StatusCallbackEvent": "participant-speech-start",
"Timestamp": "2021-04-28 22:51:51.480853Z",
"To": "+12132045020"
}

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Status callback HTTP attributes

The attributes contained in the statusCallback request to your URL.

ATTRIBUTEDESCRIPTION
AccountSidA unique identifier for the account generating this call.
CallSidA unique identifier for this call, generated by Telnyx.
ConferenceSidA unique identifier for this conference, generated by Telnyx.
FriendlyNameName given to the conference.
FromThe outbound caller number.
TimestampThe timestamp when the event was fired, given as UTC in RFC 2822 format.
ToThe inbound callee number.
SequenceNumberA sequence number ordering the multiple callbacks received. First callback has the lowest, last callback the highest.
StatusCallbackEventEvent generating the callback.

Enqueue

The <Enqueue> verb enqueues current call in a call queue.

Verb Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
actionDefines an absolute or relative URL used to send a request when the call leaves the queue. It will be sent right away when the call is dequeued using <Leave> verb. When call is dequeued using <Dial> verb, the request will be sent once the bridged calls disconnect.
methodHTTP request type used for action.GET, POSTPOST
maxWaitTimeSecsMaximum time in seconds to wait in the queue.1-1440014400
waitUrlSpecifies the URL to the TeXML document that will be executed when the call is waiting in the queue. Once all the commands from the flow are executed, the waitUrl is re-requested, and the TeXML document is run once again. Verbs that are supported in the waitUrl TeXML document: <Play>, <Say>, <Gather>, <Pause>, <Hangup>, <Redirect>, <Leave>.
waitUrlMethodHTTP request type used for waitUrl.GET, POSTPOST

Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Enqueue waitUrl="/wait_in_queue">TestQueue</Enqueue>
</Response>

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<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Enqueue maxWaitTimeSecs="60" action="/dequeue_action">TestQueue</Enqueue>
</Response>

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Gather

The <Gather> verb collects DTMF tones during a call. <Say> can be nested within <Gather> to create an interactive IVR with text-to-speech.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
actionURL where TeXML will send the gathered digits. Same method (GET/POST) as set for the TexML application is used. Transfers control of the current call to the TeXML file returned.
finishOnKeyThe set of digits, (0-9, *, #), that indicates the end of the gather.
numDigitsThe number of digits to be gathered.
minDigitsMinimum number of digits to be gathered.1-1281
maxDigitsMaximum number of digits to be gathered.1-128128
languageThe language used.See RESTful API documentation en-US
timeoutTime in seconds between digits before the <Gather> digits are sent to your action URL. Telnyx will wait until all nested verbs have been executed before beginning the timeout period.1-1205
validDigitsThe set of valid digits for the gather action.
invalidDigitsActionURL where TeXML will send the invalid gathered digits. Same method (GET/POST) as set for the TeXML application is used. Transfers control of the current call to the TeXML file returned.action

Nouns

NOUNDESCRIPTION
<Say>Reads supplied text back to the caller.
<Play>Plays an audio URL back to the caller.

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Gather action="/processdtmf.php" finishOnKey="*" timeout="20">
<Say>Please press 1 for sales, or 2 for support. Press * to exit the menu.</Say>
</Gather>
<Say>We did not receive any input. Goodbye!</Say>
</Response>

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Expected callbacks

action

{
"AccountSid":"cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallSid":"v2:DPNqxVjTNtQYaKdcKbU0QgRFrQ3YzuAQrVYC4Ggcuq7zTpDkUB7A4w",
"CallSidLegacy":"v2:DPNqxVjTNtQYaKdcKbU0QgRFrQ3YzuAQrVYC4Ggcuq7zTpDkUB7A4w",
"Digits":"1",
"From":"[email protected]",
"To":"+12132045020"
}

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ATTRIBUTEDESCRIPTION
AccountSidA unique identifier for the account generating this call.
CallSidA unique identifier for this call, generated by Telnyx.
FromThe outbound caller number.
ToThe inbound callee number.
DigitsThe digits entered in the gather process by the callee.

Leave

The <Leave> verb removes a call from queue and continues with the next verb after the original <Enqueue>.

Verb Attributes

The <Leave> verb doesn't support any attributes.

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Leave />
</Response>

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Hangup

The <Hangup> verb ends the current call. There are no attributes associated with <Hangup> and no nouns can be nested within it.

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Say>Support line is closed. Please try again tomorrow.</Say>
<Hangup />
</Response>

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Expected callbacks

completed

{
"AccountSid": "cb6cfbbc-eb00-41af-a3f3-0d7b32009e4b",
"CallDuration": "2",
"CallSid": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallSidLegacy": "v2:7V3r4VFCGLTzKLOveE0-7vM9dX17-NRQgU1byo-uuOIX9JcDadLLKw",
"CallStatus": "completed",
"CallbackSource": "call-progress-events",
"From": "+18445931290",
"HangupSource": "callee",
"SequenceNumber": "0",
"Timestamp": "2021-04-28 21:51:18.731479Z",
"To": "+13122010055"
}

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Status callback HTTP attributes

The attributes contained in the statusCallback request to your URL.

ATTRIBUTEDESCRIPTION
AccountSidA unique identifier for the account generating this call.
CallSidA unique identifier for this call, generated by Telnyx.
CallStatusA descriptive status for the call. The value is one of completed, busy or canceled.
TimestampThe timestamp when the event was fired, given as UTC in RFC 2822 format.
CallbackSourceA string that describes the source of the webhook. This is provided to help disambiguate why the webhook was made. On Status Callbacks, this value is always call-progress-events.
FromThe outbound caller number.
ToThe inbound callee number.
SequenceNumberA sequence number ordering the multiple callbacks received. First callback has the lowest, last callback the highest.
HangupSourceSource of the hangup. The value can be callee or caller

HttpRequest

The <HttpRequest> verb sends a request to the external servers. It consists of 2 child nodes <Request> and <Response>

Request

The <Request> node defines all the attributes of the request. It can have 2 child nodes <Headers> and <Body>

Request attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
urlUrl to send the request.http://example.com
methodMethod for the request (GET or POST)GETGET
asyncDefines if TeXML process should wait for the request response. When it is set to false, the callback will be sent to action url, when the request is processedtruefalse
actionDefines the action url that will be used to send the callback when the request is processed (only if async is set to false)http://example.com

Example

<Response>
<HttpRequest>
<Request url="https://example.com" method="POST" async=”true”>
<Headers>
<Header>
<Key>Authorization</Key>
<Value>Bearer API_key</Value>
</Header>
<Header>
<Key>Content-Type</Key>
<Value>application/json</Value>
</Header>
</Headers>
<Body>
<![CDATA[
{
"from":{{From}}
}
]]>
</Body>
</Request>
</HttpRequest>
</Response>

Response

The <Response> node allows assigning required parts of the response to the variables that will be passed to the action url. It will be triggered only if the async is set to false.

Example

<Response>
<HttpRequest>
<Request url="https://example.com" method="POST" async=”false”>
...
</Request>
<Response>
<Type>JSON</Type>
<StatusCode>200</StatusCode>
<Content>
<Field>
<Name>contact.name.first</Name>
<Value>first_name</Value>
</Field>
<Field>
<Name>contact.name.last</Name>
<Value>last_name</Value>
</Field>
</Content>
</Response>
</HttpRequest>
</Response>

Pause

The <Pause> verb waits silently for a specified number of seconds or one second by default. No nouns can be nested within <Pause> and a self-closing tag must be used.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
lengthOptional length of time in seconds to wait.1-1801

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Pause length="5"/>
</Response>

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Play

The <Play> verb plays an MP3 or WAV audio file, that Telnyx fetches from the URL you configure, back to the caller.

<Play> can be used independently as a verb or nested within <Gather> as a noun to play an audio file while waiting for DTMF tones.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
loopThe number of times between 1-100 to repeat the audio file.1-100. 0 for infinite.1

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Gather action="/processdtmf.php">
<Play loop="10">http://www.example.com/sounds/greeting.wav</Play>
</Gather>
</Response>

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Record

The <Record> verb creates an audio file with the call audio. If a recordingStatusCallback, Telnyx will deliver the URL for the recording to that address once the call has ended. Recording URLs are valid for 10 minutes after the call has ended. All recordings are also available via the Telnyx Mission Control Portal.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
actionOptional URL where TeXML will make a request to when the <Record> ends to retrieve a new set of TeXML instructions to continue the call flow sent with additional request parameters.
methodHTTP request type used to retrieve the next set of instructions.GET, POSTPOST
finishOnKeySet of digits specified together, any one of which will end the recording.Any digit, #, *1234567890*#
playBeepWhether or not a sound is played before the start of a recording.true, falsetrue
maxLengthDefines the maximum length for the recording in seconds.0-14400, 0 for infinite0
channelsWhen using dual channels, final audio file will be stereo recorded with the first leg on channel A, and the rest on channel B.dual, monodual
recordingStatusCallbackOptional URL that tells Telnyx where to make its GET or POST request when the recording is available.
recordingStatusCallbackMethodHTTP request type used for recordingStatusCallback.GET, POSTPOST
timeoutThe number of seconds that Telnyx will wait for the recording to be stopped if silence is detected. The timer only starts when the speech is detected. Please note that the transcription is used to detect silence and the related charge will be applied.Any integer greater than 0. 0 for infinite0
trimWill remove silence from the beginning and end of the recording when set to trim-silence.trim-silence

Additional action parameters

recordingStatusCallback will be used to deliver the final URL and information on the call recording. If available TeXML will also send recording information along with the request to the action URL with the following parameters:

ATTRIBUTEDESCRIPTION
RecordingURLThe URL of the recorded audio. The recording file may not yet be accessible when the action callback is sent. Use recordingStatusCallback for reliable notification on when the recording is available for access.
RecordingDurationThe duration of the recorded audio (in seconds). To get a final accurate recording duration after any trimming of silence, use recordingStatusCallback.
DigitsThe key (if any) pressed to end the recording or hangup if the caller hung up.

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Record action="/recordingfinish.php" recordingStatusCallback="https://wwww.foo.com/recording-storage/" playBeep="true" finishOnKey="*9"/>
<Say>
You reached Telnyx Sales voicemail.
Please leave a message after the beep.
Press the pound key when finished.
</Say>
</Response>

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Redirect

The <Redirect> verb transfers control of the current call to another TeXML application. This is useful to create a tree structure of TeXML files for different applications. No nouns can be nested within <Redirect>.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
methodThe type of requested used <Redirect> URL.GET, POSTPOST

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Redirect>http://www.example.com/TeXML/redirect.xml</Redirect>
</Response>

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Refer

The <Refer> verb in Telnyx allows you to transfer a phone call to another SIP infrastructure during a TeXML call. You can initiate it at any point during the call. When you use the <Refer> verb, Telnyx will replace the original call with a new call to the external system you specify, effectively transferring the call to that system.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
actionOptional URL where TeXML will make a request to when the <Refer> verb ends, to retrieve a new set of TeXML instructions to continue the call flow.
methodHTTP request type used to retrieve the next set of instructions.GET, POSTPOST

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Refer>
<Sip>sip:[email protected]</Sip>
</Refer>
</Response>

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Expected callbacks

If action is set you can expect the following webhook when the <Refer> verb finishes. New set of TeXML instructions should be returned in response.

{
"AccountSid": "6d547b4f-993a-4e87-b95c-2d9460b3824b",
"CallSid": "v3:wf0h6MLq0PIHItrkFyEPM0WLPAarG_fUA2MLQqkLYRhRRrCqnT6TPg",
"CallSidLegacy": "v3:wf0h6MLq0PIHItrkFyEPM0WLPAarG_fUA2MLQqkLYRhRRrCqnT6TPg",
"ReferCallStatus": "in-progress",
"ReferSipResponseCode": "202",
"NotifySipResponseCode": "200",
"Timestamp": "2021-04-28 21:51:13.591099Z"
}

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Action callback HTTP attributes

The attributes contained in the action request to your URL.

ATTRIBUTEDESCRIPTION
AccountSidA unique identifier for the account generating this call.
CallSidA unique identifier for this call, generated by Telnyx.
ReferCallStatusProvides new call status based on SIP NOTIFY messages. May be omitted if REFER fails or no NOTIFY requests are received. Possible values: in-progress, busy, canceled, failed
ReferSipResponseCodeThis indicates the SIP response code that Telnyx receives from the SIP endpoint in response to the REFER request.
NotifySipResponseCodeReflects final SIP response code on referred leg, based on NOTIFY messages. May be omitted if REFER fails or no NOTIFY requests are received.
TimestampThe timestamp when the event was fired, given as UTC in RFC 2822 format.

Reject

The <Reject> verb rejects a call to your Telnyx number. It is effectively an exit statement from the current document, as there is no way to return to any instructions listed after the <Reject> verb. If placed as the very first verb in an incoming call, <Reject> will prevent the call from being answered and will incur no cost. If placed elsewhere in the call, the call will hang up but will be charged up to that point.

You can't nest any verbs within <Reject> and you can't nest <Reject> in any other verbs.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
reasonThe tone to play to indicate the reason the call was rejected.rejected, busyrejected

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Reject />
</Response>

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Say

The <Say> verb speaks the text specified back to the caller enabling text to speech for any application.

Verb attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
voiceOptional text-to-speech voice type. For basic text-to-speech use man or woman. For premium text-to-speech including additional language accent support beyond en-US, use alice or prescribe a specific Amazon Polly voice in the form of Polly.*. All standard Amazon Polly voices are supported, e.g. Polly.Joanna.man, woman, alice, Polly.*man
languageISO language type to be used if voice type alice is selected. If man or woman is selected, the language accent will always be en-US. This parameter is ignored when a specific Amazon Polly voice is used.See RESTful API documentationen-US
loopThe number of times to repeat the speech.1-100. 0 for infinite.1

Example

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Say voice="alice">This is a premium Amazon Polly text-to-speech message!</Say>
</Response>

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Stream

The <Stream> instruction starts streaming the media from a call to a specific WebSocket address in near-realtime. Audio will be delivered as base64-encoded RTP packets, wrapped in JSON payloads. When used with <Start> verb it starts asynchronous stream to your websocket destination url. For synchronous bi-directional stream please use <Connect> verb.

<Stream> Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
urlThe destination WebSocket address where the stream is going to be delivered.
trackSpecifies which track should be streamed.inbound_track, outbound_track, both_tracksinbound_track

Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Start>
<Stream url="wss://yourdomain.com/stream" track=”both_tracks” />
</Start>
</Response>

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Suppression

The <Suppression> instruction starts noise suppression on the call to improve audio quality.

<Suppression> Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
directionSpecifies which side of the audio shall be denoised.inbound, outbound, bothinbound

Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Start>
<Suppression direction="both" />
</Start>
</Response>

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Transcription

The <Transcription> instruction starts real-time transcription on the call.

<Transcription> Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
interimResultsWhether to send also interim results. If set to false, only final results will be sent. Applies to transcriptionEngine A only.true, falsefalse
languageLanguage to use for speech recognition.de, en, es, fr, it, plen
transcriptionEngineEngine to use for speech recognition.A - google, B - telnyxA
transcriptionTracksIndicates which leg of the call will be transcribed. Use inbound for the leg that requested the transcription, outbound for the other leg, and both for both legs of the call.inbound, outbound, bothinbound
transcriptionCallbackURL that tells Telnyx where to make its GET or POST requests with transcription data.
transcriptionCallbackMethodHTTP request type used for transcriptionCallbackGET, POSTPOST

Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Start>
<Transcription language="en" interimResults="true" transcriptionCallback="/transcription" />
</Start>
</Response>

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Stop

The <Stop> verb stops specified by noun instruction on a call.

Nouns

NOUNDESCRIPTION
<Stream>Stops current media stream, no attributes need to be provided
<Transcription>Stops current transcription, no attributes need to be provided
<Suppression>Stops current suppression, no attributes need to be provided

Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Stop>
<Stream />
</Stop>
</Response>

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