[reSIProcate] SDP message body question reposted

["Wenwei Xu" <wxu@xxxxxxxxxxxxx>]

All,

 

I posted a question regarding the SDP message body earlier. Since nobody answer my question, let rephrase the question and repost it.

 

A typical SDP description is:

        v=0

        o=- 2890844526 2890842807 IN IP4 126.16.64.4

        s=SDP Seminar

        i=A Seminar on the session description protocol

        u=http://www.cs.ucl.ac.uk/staff/M.Handley/sdp.03.ps

        c=IN IP4 224.2.17.12/127

        t=2873397496 2873404696

        a=recvonly

        m=audio 49170 RTP/AVP 0

        m=video 51372 RTP/AVP 31

        m=application 32416 udp wb

        a=orient:portrait

But in the SIP message’s message body, it will be augmented as follows:

            Session Description Protocol

              Session Description Protocol Version (v): 0

              Owner/Creator, Session Id(o): - 2873397496 0 IN IP4 126.16.64.5

                Owner Username: -

                Session ID: 2873397496

                Session Version: 0

                Owner Network Type: IP4

                Owner Address: 126.16.64.5

            ……..(ignored)

 

 

This will add a lot of bytes to the SIP message. So my question is: Is it necessary that a typical SDP description should be augmented as above? Can we just use the original SDP description in the SIP message?

 

 

Thanks,

Wenwei Xu