TeXML fundamentals

TeXML is an XML-based data structure used to build quick voice applications designed to be a simple yet powerful way to control phone calls using a set of dedicated Verbs and Nouns.

See Verbs & Nouns for detail.

A TeXML Application is a configuration entity that defines how Telnyx handles your voice calls. It serves as the central point for managing both inbound and outbound calls through TeXML instructions.

When creating a TeXML Application, you will need to configure the following fields:

Field	Description
Application Name	A descriptive name to identify your TeXML application
AnchorSite	Defines preferable data center for handling the traffic. In case of latency ICMP ping to the webhook URL address will be used to calculate the closed data center.
Voice method	HTTP method that will be used to interact with your webhooks
Webhook URL	The URL where Telnyx will fetch TeXML instructions when a call is initiated. The instruction can be served by Telnyx. In that case select TeXML bin URL. See TeXML bin quickstart for more details.
Webhook Failover URL	A backup URL that Telnyx will use if the primary webhook URL fails to respond
Call progress events URL	URL where Telnyx will send event callbacks related to your calls
Status Callback Method	HTTP method (GET or POST) used for status callbacks
Hang-up on timeout	Specifies the number of seconds Telnyx will wait for initial application response before hanging up
DTMF Type	Configuration for how DTMF (touch-tone) inputs are handled
Enable Call Cost	Specify if the call cost webhook should be sent

You can create a TeXML Application through the Telnyx Mission Control Portal or via the Telnyx API.

In order to use Sip Trunking application with TeXML:

1. Create a SIP trunking application by following the guide Configure SIP Trunking user guide
2. To enable TeXML processing:
   • provide the Webhook URL - Telnyx will send the instruction fetch requests to It
   • select Webhook API version to TeXML
   • and enable Park all outbound calls option

See Instruction fetching tutorial to learn how to make and receive calls using TeXML applications.

See Twilio Compatibility for detail.