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Overview

The 

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 supports pass-through of the text media streams based on the T.140 codec. The t140Call flag is added to the Packet Service Profile to support T.140 calls.

The

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 supports:

  • Calls with only T.140 stream.
  • T.140 stream pass-through when it is part of multiple stream sessions (audio and Video calls).  
  • SDP update in 200 OK for T.140 streams  (controlled by the flag sendUpdatedSdpIn200Ok in the ingress IP attributes).  
  • Direct Media calls with T.140 streams.
  • Late media pass-through calls with T.140 streams.
  • Downstream forking calls with T.140 streams.
  • Ring Back Tone (RBT) call flows, all types of direct media, LI, SRTP/DTLS pass-through calls with T.140 streams.

The following session modifications are supported for the T.140 sessions:

  • Addition and/or removal of T.140 streams.
  • Modification triggered due to change in T.140 stream attributes.
  • Modification triggered due to changes in session attributes for non-T.140 stream related attributes.

The

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 does not validate, prioritize, or purge any codec or attributes received for the text media. Any validation required is performed by the endpoints.

Text Codecs SIP

 The 

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relays text codec by default using dynamic payloads.

Text Codecs T.140

The

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 supports the following codec for text call scenarios (that is, Text - Text calls with an audio and video stream).

Table 1: Supported Codecs for Text Call

Codec VariantPayload Type
T.140Dynamic

T140 Passthrough 

The

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 supports T.140 passthrough calls over GW-GW interface between the
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 (
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-
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).

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