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List:       sip-implementors
Subject:    [Sip-implementors] Query Regarding Offer Answer
From:       Gaurav Kumar <gaurav.kumar () ittiam ! com>
Date:       2013-02-21 14:37:03
Message-ID: 0CB971BE613AD249A3DBCC0E50643ED63090FA5C () SINPRD0210MB393 ! apcprd02 ! prod ! outlook ! com
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Hi,

While interop with third party vendor sip device, we have got the following message \
exchange (Only SDP message shown for sake of clarity)

Device 1  Device 2

INVITE (no SDP) -------------------------->

<---------------------------- 200 OK (SDP shown below)
v=0
o=11701 0 0 IN IP4 172.26.29.33
s=-
c=IN IP4 172.26.29.33
t=0 0
m=audio 50000 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-11,16
m=video 50002 RTP/AVP 96
a=rtpmap:96 H264/90000
a=fmtp:96 profile-level-id=42801f; max-mbps=108000; max-fs=3600; max-br=5125

ACK (SDP shown below) ------------------------->
v=0
o=- 4865 4865 IN IP4 172.26.29.5
s=-
c=IN IP4 172.26.29.5
t=0 0
m=audio 30250 RTP/AVP 0 101
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
m=video 0 RTP/AVP 96

REINVITE (SDP shown below) ------------------------->
v=0
o=- 4865 4866 IN IP4 172.26.29.5
s=-
c=IN IP4 172.26.29.5
t=0 0
m=audio 30250 RTP/AVP 0 8 18 102 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendonly
a=rtpmap:102 G7221/8000
m=audio 30250 RTP/SAVP 0 8 18 102 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendonly
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:YmJhYjY4YWM1MzRlYzFkNTZmZTg2Mzc5OGFmNDM1
a=rtpmap:102 G7221/8000

According to the RFC 3264 standard, REINVITE SDP should be like below. As the \
negotiated streams were two in the initial offer answer. The new stream should be \
added below the existing streams. Please correct me If I am wrong.

v=0
o=- 4865 4866 IN IP4 172.26.29.5
s=-
c=IN IP4 172.26.29.5
t=0 0
m=audio 30250 RTP/AVP 0 8 18 102 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendonly
a=rtpmap:102 G7221/8000
m=video 0 RTP/AVP 96
m=audio 30250 RTP/SAVP 0 8 18 102 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendonly
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:YmJhYjY4YWM1MzRlYzFkNTZmZTg2Mzc5OGFmNDM1
a=rtpmap:102 G7221/8000

Thanks,
Gaurav



This is confidential Ittiam property.

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