My Understanding is,
Since UAC is received final response from UAS the case where in
"unless the final response is 2xx and any of the unacknowledged reliable
provisional responses contained a session description."
But Still UAS "MUST be prepared to process PRACK requests for those
outstanding responses" according to this UAC can retransmit the PRACK.
My view point in Tamal scenario is the provisional response and
2xx is not containing any SDP. Do we need to really keep the PRACK in
this case? I don't think this is useful can be roll-back.
Kindly revert back if any concerns.
Regards
Oviaprasad D
ESN: 6-877-7352
-----Original Message-----
From: Serbang, Nabam (Nabam) [mailto:[email protected]]
Sent: Wednesday, December 17, 2008 11:14 PM
To: Oviaprasad Dharuman (WT01 - Telecom Equipment); Tamal Tanu biswas
(WT01 - Product Engineering Services)
Cc: [email protected]
Subject: RE: [Sip-implementors] INVITE Behaviour When PRACK is
notrespondedwith 2xx
HI Oviaprasad D,
I guess the question was after UAC has sent the RPACK but UAS didn't
receive it. The quote "The UAC MAY acknowledge reliable provisional
responses received after
the final response or MAY discard them." is applicable only before
PRACK has been sent meaning, when reliable provisional was received by
UAC, it may ack with PRACK. But in this case PRACK has already been
sent. Here question remains: what happen to PRACK transaction? I think
Initiated transaction must be committed or roll-backed.
Thanks and regards
Nabam Serbang
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, December 16, 2008 5:13 PM
To: [email protected]
Cc: [email protected]
Subject: Re: [Sip-implementors] INVITE Behaviour When PRACK is
notrespondedwith 2xx
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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check this email and any attachments for the presence of viruses. The company
accepts no liability for any damage caused by any virus transmitted by this
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