[SIPForum-discussion] Cancel transaction

[Vijay Tiwari]

Hello Dileep

If you go though the definition of transaction the you able to understand
with request is past of transaction and which one not.

definition says



"A transaction is a sequence of SIP messages exchanged between SIP network
elements. A transaction consists of one request and all responses to that
request. That includes zero or more provisional responses and one or more
final responses (remember that an INVITE might be answered by more than one
final response when a proxy server forks the request)."



Thanks

vijay




On Tue, May 18, 2010 at 2:14 PM, Dileep Ravindran <
dileepravindran at tataelxsi.co.in> wrote:

>  Thanks all for the clarification on PRACK
> If every request is a new transaction then i see that CANCEL has the same
> braNch parameter as INVITE ..... then is CANCEL a new transaction? if yes
> how do we differ it as a new transaction??
>
>
> Thanks
> Dileep
>
> ----- Original Message -----
> *From:* Vijay Tiwari <vijay11tiwari at gmail.com>
> *To:* Dileep Ravindran <dileepravindran at tataelxsi.co.in>
> *Cc:* discussion at sipforum.org
> *Sent:* Tuesday, May 18, 2010 1:20 PM
> *Subject:* Re: [SIPForum-discussion] Prack
>
> Yes, PRACK will be a new transaction and it will be identity by Vai branch
> parameter. please find the below logs for the same
>
>
>  SIP/2.0 183 Session Progress
> Via: SIP/2.0/UDP 8.19.19.06:5060 <http://8.19.19.6:5060/>;
> branch=z9hG4bK4545
> From: <sip:filo.farnsworth at television.tv <filo.farnsworth at television.tv>
> >;tag=12
> To: <+12025551313 at gw.carrier.com <+12025551313 at gw.carrier.com>;user=phone>;tag=37
>
> Call-ID: 49235243082018498 at television.tv
> CSeq: 1 INVITE
> RSeq: 08071
> Contact: <sip:50.60.70.80>
> Content-Type: application/sdp
> Content-Length: 139
>
> v=0
> o=Port1723 2890844535 2890844535 IN IP4 50.60.70.80
> s=-
> t=0 0
> c=IN IP4 50.60.70.80
> m=audio 62002 RTP/AVP 0
> a=rtpmap:0 PCMU/8000
>
>
>
>
>  PRACK sip:50.60.70.80 SIP/2.0
> Via: SIP/2.0/UDP 8.19.19.06:5060 <http://8.19.19.6:5060/>;
> branch=z9hG4bK454
> Max-Forwards: 70
> From: <sip:filo.farnsworth at television.tv<sip%3Afilo.farnsworth at television.tv>
> >;tag=37
> To: <sip:+12025551313 at gw.carrier.com <sip%3A%2B12025551313 at gw.carrier.com>
> ;user=phone>;tag=12
> Call-ID: 49235243082018498 at television.tv
> CSeq: 2 PRACK
> Contact: sip:filo.farnsworth at studio.television.tv<sip%3Afilo.farnsworth at studio.television.tv>
> RAck: 08071 1 INVITE
> Content-Length: 0
> both Branch id are different
>
>
> thanks
> vijay
> On Fri, May 14, 2010 at 10:27 AM, Dileep Ravindran <
> dileepravindran at tataelxsi.co.in> wrote:
>
>>  Hi All,
>>
>>    Can anyone please tell whether  PRACK  a new transaction?? and if yes
>> which  parameter that tells that its a new transaction??
>> \Thanks
>> Dileep
>>
>>
>>
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>>
>
>
> --
> They can because they think they can.
>
>
>
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>


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