Comments Inline...
Regards,
Nataraju A B
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Aneesh Naik
Sent: Thursday, December 20, 2007 5:33 PM
To: Sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] SDP longer than that given in
Content-Lenghtheader
Hi,
What should be the behavior when SDP is longer than that
given in Content-Length header?
The RFC 3261 section 18.3 Framing states:
If there are additional bytes in the transport packet beyond
the end of the body, they MUST be discarded.
So this means, SIP parser should discard the data beyond the
length given by Content-Lenght header.
In the below case the call should fail as we wont get enough
data from SDP to complete the call as we will drop them.
INVITE sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.1.209:5061;branch=z9hG4bK-15126-1-0
From: sipp sip:[EMAIL PROTECTED]:5061;tag=15126SIPpTag001
To: sut sip:[EMAIL PROTECTED]:5060
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Contact: sip:[EMAIL PROTECTED]:5061
Max-Forwards: 70
Subject: Performance Test
Content-Type: application/sdp
*Content-Length: 20*
v=0
o=user1 53655765 2353687637 IN IP4 10.253.6.209
s=-
c=IN IP4 10.253.6.209
t=0 0
m=audio 6001 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Please suggest what must be the behavior in this case.
[ABN] since this message is received over UDP transport, it would be
preferred to consider whole packet and give less precedence to
content-length header value. Even RFC.3261 suggests discard the rest of
the bytes, but being liberal here would make the UA implementation more
robust also.
In case of TCP transport you should use the content-length header value
strictly to determine the body of the received SIP request/response.
This is my understanding, please add on if something better or preferred
alternatives are available
Thanks,
Aneesh
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