hi,
UAS MUST not send 200OK for PRACK and must ignore the PRACK. UAS .
As per RFC 3262 section 5
All user agents that support this extension MUST support all
offer/answer exchanges that are possible based on the rules in
Section 13.2 of RFC 3261, based on the existence of INVITE and PRACK
as requests, and 2xx and reliable 1xx as non-failure reliable
responses.
As the first offer answer is not completed. here UAC is violating Section 13.2
of RFC 3261. So UAS should not entertain the PRACK having offer.
Thanks
Sourav
________________________________
From: Krishna Rao Gurram <[email protected]>
To: "[email protected]"
<[email protected]>
Sent: Thursday, 30 April, 2009 1:50:24 PM
Subject: [Sip-implementors] What is the server side behavior if PRACK with new
SDP receives (Urgent!!!!!!)
Scenario:-
UAS receives Invite with SDP.
Application above UAS sends 100 Trying
Application now sends 180 without SDP and with 100 rel.
UAS receives PRACK with SDP for 180.
Here what is the behavior of UAS? How to handle this PRACK at the UAS end.
Please find the messages.
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 172.16.107.21:51594;branch=z9hG4bK629348334-18296
From: Alice<sip:[email protected]:51594>;tag=abc123def
To: Bob<sip:[email protected] >
Call-ID: [email protected]
Cseq: 1 INVITE
Contact: sip:[email protected]:51594
Max-Forwards: 70
Accept: application/sdp
Supported: 100rel, replaces
<------------------------------
Require:100rel
Content-Type: application/sdp
Content-Length: 131
v=0
o=ICF 12345 787 IN IP4 10.203.154.44
s=Session
c=IN IP4 10.203.154.44
t=0 0
m=audio 4568 RTP/AVP 0
b=AS:128
a=ptime:20
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 172.16.107.21:51594;branch=z9hG4bK629348334-18296
From: Alice<sip:[email protected]:51594>;tag=abc123def
To: Bob<sip:[email protected]>;tag=ICF_4168957464-5666
Call-ID: [email protected]
--------------------->
CSeq: 1 INVITE
Supported: timer
Contact: Bob<sip:[email protected]:51591>
Content-Length: 0
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 172.16.107.21:51594;branch=z9hG4bK629348334-18296
From: Alice<sip:[email protected]:51594>;tag=abc123def
To: Bob<sip:[email protected]>;tag=ICF_4168957464-5666 - -
--------------->
Call-ID: [email protected]
CSeq: 1 INVITE
Supported: 100rel,replaces,precondition,timer
Require: 100rel
RSeq: 2
Contact: Bob<sip:[email protected]:51591>
Allow: INVITE,ACK,CANCEL,BYE,OPTIONS,UPDATE
Content-Length: 0
PRACK sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 172.16.107.21:51594;branch=z9hG4bK629348334-18296
From: Alice<sip:[email protected]:51594>;tag=abc123def
To: Bob<sip:[email protected] >;tag=ICF_4168957464-5666
Call-ID: [email protected]
Cseq: 1 PRACK
Contact: sip:[email protected]:51594
RAck: 2 1 INVITE
<----------------
Max-Forwards: 70
Accept: application/sdp
Expires: 3600
Supported: replaces,100rel
Require:100rel
Content-type: application/sdp
Content-Length: 131
v=0
o=ICF 12345 788 IN IP4 10.203.154.44
s=Session
c=IN IP4 10.203.154.44
t=0 0
m=audio 4568 RTP/AVP 8
b=AS:128
a=ptime:20
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