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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.

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Attributes

ATTRIBUTEDESCRIPTIONOPTIONSDEFAULT
action Optional URL where TeXML will make a request when the Refer verb ends, to retrieve a new set of TeXML instructions to continue the call flow. -
method HTTP request type used to retrieve the next set of instructions. GET, POSTPOST

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Examples

<?xml version="1.0" encoding="UTF-8"?>
<Response>
    <Refer>
        <Sip>sip:john@example.com</Sip>
    </Refer>
</Response>

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Expected callbacks

If action is set, you can expect the following webhook when the <Refer> verb finishes. A 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

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, no-answer, 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 the 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.