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
"DISCLAIMER: This message is proprietary to Aricent and is intended solely for
the use of the individual to whom it is addressed. It may contain privileged or
confidential information and should not be circulated or used for any purpose
other than for what it is intended. If you have received this message in
error,please notify the originator immediately. If you are not the intended
recipient, you are notified that you are strictly prohibited from using,
copying, altering, or disclosing the contents of this message. Aricent accepts
no responsibility for loss or damage arising from the use of the information
transmitted by this email including damage from virus."
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