[VOIPSEC] How does SIP differentiate Data from other media in IMS network

[Christopher A. Martin]

Mara, Jean-Pierre (Jean-Pierre) wrote:

>Dear VoIP members,
> IMS is considered as an enabler for creating value through true convergence
>. That is, creating networks that deliver end-user communications services
>that are simple, secure and seamless for people at work, home or anywhere in
>between.  Further IMS at the heart of open-standards architecture will allow
>for conveying Data, Voice, Video  or short IMS will carry Multi Media
>Sessions
>
>I am checking the mailing daily for example on how a SIP network treat Data.
>Unfortunately, most of the example I run into describe how SIP treat voice
>packet only (VoIP) but Data.
>
>My query is about a SIP UA that have successfully registered in an IMS
>environment. I would like to know if it is correct to state that like  with
>voice call (SIP VoIP) , the  SDP negotiation will allow to detect raw data
>only  and trigger out the RTP/RTCP and finally fall back into classic TCP/IP
>data handling . 
>
>Am I wrong in expecting the SDP to be something similar to the following?
>v=0
>       o=jpmara xxxxxxxx yyyyyyy IN IP4 one.sip.com
>       t=a b
>       c=IN IP4 192.x.x.x/y
>       a=abc:zxyz
>       m=data 10/100/10000  Mbps
>       ..
>       ..
>
>
>I am struggling with the question to understand what happen with data sent
>by a UA in a IMS environnment.  There should be a description or Call flow
>but I do not seem to find such a description.
>
>thank for your comment
>
>Jean-Pierre MARA
>
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>
>  
>
The SDP represent data as a mime type and usually would become part of a 
sip stream if I remember correctly, not embedded in RTP. RTP is 
typically just audio media as far as I remember...(Let me go dust my 
cobwebs)

Chris