IMG 1010 - SIP Media Baudot Detection and retransmit Call Flow to TTY transcoding server.

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1. An initial INVITE from IMG to SIP Server, any vocoder can be negotiated.

2. Upon detection of Baudot tone, the IMG shall send a Re-INVITE:

   1. SDP is the same as negotiated initially,

   2. R-URI will carry custom parameter “tty-ind”, indicating Baudot tone has been detected.

3. Application Server will send Re-INVITE to IMG

   1. SDP shall specify G711 codec in order to establish G711 voice path,

   2. SDP will specify information to establish media stream to the T.140/RFC4103 transcoder.

Note: The Baudot detection feature is available on PICASSO voice module only.

Note: The media received by the IMG, between the Baudot tone detection and the reception of the Re-INVITE from Application server, will not be sent to the T.140/RFC4103 transcoder.

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The Baudot tone detection feature is configured in the IP Bearer profile and SIP SGP profile panes.

1- ClientView → Profiles →  IP Bearer Profile →  Baudot Mode

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