Hi Tamal,
Please find the quote from RFC 3262 sec 4.
"The UAC MAY acknowledge reliable provisional responses received after
the final response or MAY discard them."
The PRACK is required and to be waited for the 2xx to the PRACK which
quoted bellow from sec 5.
"If the UAS receives a PRACK with an
offer, it MUST place the answer in the 2xx to the PRACK" also
"If the UAS had placed a session description in any reliable
provisional response that is unacknowledged when the INVITE is
accepted, the UAS MUST delay sending the 2xx until the provisional
response is acknowledged. Otherwise, the reliability of the 1xx
cannot be guaranteed, and reliability is needed for proper operation
of the offer/answer exchange"
My view point is your question is applicable for sec 4 quote on this
email.
Regards
Oviaprasad D
ESN: 6-877-7352
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, December 16, 2008 3:56 PM
To: [email protected]
Subject: [Sip-implementors] INVITE Behaviour When PRACK is not
respondedwith 2xx
Dear all,
Could you please let me know the behaviour of UAC in the following
scenario (RFC3262 doesn't seem to address this behaviour).
Scenario 1:
UAC UAS
----INV------->
<---180--------
---PRACK----->
(Peer didnt respond to PRACK because of some problem)
<---200 INV----
----ACK------->
----PRACK-----> ??
Should UAC retransmit PRACK ?
or
Should the PRACK retransmissions stop after receiving 200OK to INVITE?
Scenario 2:
UAC UAS
----INV------->
<---180--------
----PRACK----->
(Peer didnt respond to PRACK because of some problem)
----CANCEL---->
<---200 CAN----
<---487 INV----
----ACK------->
----PRACK-----> ??
Should UAC retransmit PRACK ?
or
Should the PRACK retransmissions stop after receiving 487 to INVITE?
Thanks & Regards
Tamal Tanu Biswas
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