[SIPForum-discussion] Need suggestion

[shilpi gupta]

Hi syed,

It's clearly mentioned in RFC 3261 that "The branch parameter value MUST be
unique across space and time for
all requests sent by the UA. The exceptions to this rule are CANCEL
and ACK for non-2xx responses."
and also says that "The uniqueness property of the branch ID parameter, to
facilitate
its use as a transaction ID". so it must be unique for all transactions
genmertaed by same User agent.

On Sun, Dec 23, 2012 at 1:49 AM, SYED IQBAL Ali <s.iqbalali2005 at gmail.com>wrote:

> Hi i have a question about branch parameter in Via header for below
> scenarios.
>
>
>
>
>
> Scenarios:
>
> 1)
>
> OPTIONS sip:user1 at Server_IP SIP/2.0
>
> Via:SIP/2.0/UDP Client_IP:9080;branch=z9hG4bKABC
>
> Call-ID: Call_ID1 at Client_IP:9080
>
> From: <sip:user1 at Client_IP:9080>;tag=1000000-0-803298131-9080
>
> To: <sip:user1 at Server_IP:5060>
>
> CSeq: 1 OPTIONS
>
> Content-Length: 0
>
> Contact: <sip:user1 at Client_IP:9080>
>
> Max-Forwards: 70
>
>
>
> ====================
>
> 2)
>
> OPTIONS sip:user2 at Server_IP SIP/2.0
>
> Via:SIP/2.0/UDP Client_IP:9080;branch=z9hG4bKABC
>
> Call-ID: Call_ID2 at Client_IP:9080
>
> From: <sip:user2 at Client_IP:9080>;tag=1000000-0-803298131-9080
>
> To: <sip:user2 at Server_IP:5060>
>
> CSeq: 2 OPTIONS
>
> Content-Length: 0
>
> Contact: <sip:user1 at Client_IP:9080>
>
> Max-Forwards: 70
>
>
>
> 1) My question is can we use same branch parameter in both OPTIONS
> requests having different call ids or not?
>
>
>
> -Call ids are different for both request.
>
> -SIP URI is different for both call legs.
>
> - To and from headers are different for both scenarios.
> -Cseq are different in both cases.
>
>
> --
> SYED IQBAL ALI
>
> s.iqbalali2005 at gmail.com
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