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[Sip] Question regarding SDP 'M' Line

Hi All,

 

While adding a new media stream is it MUST to add a new ‘M’ line in the SDP or existing ‘M’ line can be replaced with the new one.

Please go through the below specified example and clarify me which is the correct way of implementing?

 

Example 1:

========

 

Initial INVITE:

 

m=audio 7100 RTP/AVP 0 101

a=rtcp:7101

a=sendonly

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

 

Re-Invite:

 

m=image 20112 udptl t38

a=T38FaxVersion:0

a=T38MaxBitRate:1440

 

Example 2:

========

 

Initial INVITE:

 

m=audio 7100 RTP/AVP 0 101

a=rtcp:7101

a=sendonly

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

 

Re-Invite:

 

m=audio 7100 RTP/AVP 0 101

a=rtcp:7101

a=sendonly

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

m=image 5080 udptl t38

c=IN IP4 10.101.210.30

a=T38FaxVersion:0

 

Thanks,

Jayantheesh

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