Hi,
The SDP is different, for voice (call) and data (fax) cases.
For voice the media type "audio/video", media transport protocol "RTP".
Where as for T38 fax-relay the media type "image" and the transport protocol
will be "udptl".
The "c" line ("0.0.0.0" and session/media-attribute "a"
(sendonly/recvonly/inactive) lines are different for the call hold/transfer
and a normal call.
Regards,
Satya
----- Original Message -----
From: "Manoj Priyankara [TG]" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 23, 2010 10:00 PM
Subject: [Sip-implementors] different use of SIP INVITE message
> Dear All,
>
> What is the difference between the INVITE message used for call features
> (such as Call hold, transfer etc) and the INVITE message used for codec
> negotiation ( such as T.38 fax relay) ?
>
> Thanks
> BR,
> Manoj
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