[SIPForum-discussion] query regarding prack

Thu May 1 06:38:40 UTC 2008

  Hi gaurav 

        I am agree with your lines. With few doubts. 

  If server sends 1xx without Rseq HF , Then client can send PRACK to server , in this case how the server will came to know that the client has rcvd the 1xx response , bcause the server will came to know only  from the Rack(Rseq which is rcved from the 1xx+ cseq) HF of the PRACK. In this case In the field of Rack what the client will put. Plz clarify  

On Wed, 30 Apr 2008 gaurav katiyar wrote :
>    Hi,
>      My 2 cents for this issue.
>      - If UAC supports PRACK than it should add supported header containing 100rel.
>      - If UAC supports PRACK and not including 100rel means that it supports but not interested to handle PRACK. and server should assume that uac is not supporting this extension. RFC 3262 says
>   "If the request did not include either a Supported or Require header field indicating this feature, the UAS MUST NOT send the provisional response reliably."
>
>   even if UAC receives Rseq from sip server, it means that server is not behaving as per RFC recommendations. so you are free to support sip server on  your risk :-) and you can send a PRACK but is not recommended. I think better way is to send CANCEL and send a new request with supported header containing 100rel.
>
>   -  If UAC includes supported header containing 100rel means that it supports this extension and provides flexibility to uas. UAS may send 1xx with RSeq or may not. Depends upon sip server interests. :-)
>
>   - If UAC includes require header containing 100rel  means that it is forcing to use reliable provisional responses and if server do not support that than server should respond with 420
>   (Bad Extension).
>
>   Does it make sense?
>
>   Gaurav
>
>
>mwilliam prusty <callwilliam90653 at rediffmail.com> wrote:
>
>Hi mj
>
>So you are telling that If A  is sending an Invite request , with supporrted=100rel. & without require=100rel . In thta case 183 reponse given by the B will not contain Rseq header field. plz clarify
>
>On Wed, 30 Apr 2008 mjhorse wrote :
> >Hi
> >  In addition, INVITE can also contain "Require: 100rel" which means Rseq must be set in responses.
> >
> >
> >  ------------------
> >  by mj
> >
> >
> >
> >  ------------------ Original ------------------
> >  From:  "KUMAR SAROJ NAYAK"<Saroj_Nayak.Kumar at alcatel-lucent.com>;
> >  Date:  Wed, Apr 30, 2008 03:04 PM
> >  To:  "mwilliam prusty"<callwilliam90653 at rediffmail.com>; "srinivas.banda"<srinivas.banda at wipro.com>;
> >  Cc:  "discussion"<discussion at sipforum.org>;
> >  Subject:  Re: [SIPForum-discussion] query regarding prack
> >
> >
> >  hi william
> >  plz go through the two state ment ......n i think definitely u wil get ur ans................
> >
> >
> >
> >
> >
> >
> >Thanks & regards,
> >
> >Saroj Kumar Nayak || IMS APPLICATION|| Alcatel-Lucent
> >
> >Alcatel Devlopment INDIA, Block A&B ,Plot no 25
> >
> >Sector 18 ,Electronic City ,GURGOAN 122015
> >
> >Office:  0112 44654000  | Extn: 4821
> >
> >Email: saroj_nayak.kumar at alcatel-lucent.com
> >www.alcatel-lucent.com
> >
> >
> >
> >  From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of mwilliam prusty
> >Sent: Wednesday, April 30, 2008 12:13 PM
> >To: srinivas.banda at wipro.com
> >Cc: discussion at sipforum.org
> >Subject: Re: [SIPForum-discussion] query regarding prack
> >
> >
> >
> >
> >
> >I am not very sure. about this. Have you read this any where. ?
> >
> >On Wed, 30 Apr 2008 srinivas.banda at wipro.com wrote :
> > >as per my knowledge if supported = 100 rel is not present in the initial
> > >INVITE  and even if u received 183 with Rseq, A won't send PRACK.
> > >correct me if i m wrong.
> > >
> > >Regards
> > >Srinivas
> > >
> > >________________________________
> > >
> > > From: mwilliam prusty [mailto:callwilliam90653 at rediffmail.com]
> > >Sent: Wednesday, April 30, 2008 12:03 PM
> > >To: Srinivas Banda (WT01 - TES-Enterprise Networks)
> > >Cc: discussion at sipforum.org
> > >Subject: Re: RE: [SIPForum-discussion] query regarding prack
> > >
> > >
> > >
> > >  Hi srinivas
> > >
> > >      A will decide to send PRACK ,If it rcvs Rseq header filed ,in a
> > >1xx response(except 100 trying). In this case A is getting that. SO why
> > >A will not send PRACK??/
> > >
> > >
> > >On Wed, 30 Apr 2008 srinivas.banda at wipro.com wrote :
> > > >UA A won't send Prack to the far end.
> > > >eventhough UA A supports 100 rel but it is not inserting supported=100
> > > >rel header it won't send prack.
> > > >
> > > >Regards
> > > >Srinivas
> > > >
> > > >________________________________
> > > >
> > > > From: discussion-bounces at sipforum.org
> > > >[mailto:discussion-bounces at sipforum.org] On Behalf Of mwilliam prusty
> > > >Sent: Wednesday, April 30, 2008 10:34 AM
> > > >To: discussion at sipforum.org
> > > >Subject: [SIPForum-discussion] query regarding prack
> > > >
> > > >
> > > >
> > > >
> > > >Hi Can any one tell me Suppose there are two UA they are  A & B.
> > > >
> > > >A is sending a Invite request to B , without supported=100rel header
> > > >field.( But A is supporting it) . B is sending 183 response with Rseq
> > > >header filed. In this case after A rcvs 183, Whether A will send a
> > > >Prack.?
> > > >
> > > >regs
> > > >
> > > >William
> > > >
> > > >
> > > >
> > > >Amity
> > > ><http://adworks.rediff.com/cgi-bin/AdWorks/click.cgi/www.rediff.com/sig
> > >n
> > > >ature-home.htm/1050715198 at Middle5/2070949_2063564/2071038/1?PARTNER=3&O
> > >A
> > > >S_QUERY=null>
> > > >
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