Hello Neel, For the query2(what is the real use behind the 422 response?) as you specified i proposed an optimisation. But it is not violated RFC 4028.In the section-8.1, it is specified that proxy can modify the session-expires header.
Pls provide suggesstions whether the optimisation is possible? Best Regards, Venkatesh On 4/23/07, Bala Neelakantan <[EMAIL PROTECTED]> wrote: > > Responses inline. > > Thanks, > Neel > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:sip-implementors- > > [EMAIL PROTECTED] On Behalf Of venkatesh chandran > > Sent: Saturday, April 21, 2007 5:56 AM > > To: [email protected] > > Subject: Re: [Sip-implementors] Regarding SESSION-TIMER > > > > Hello *, > > Thanks for the information. > > > > I have some more queries, > > 1)When INVITE send from UAC with the session-expires value less than the > > Min-SE configured in the proxy, the proxy will reject the INVITE with > 422 > > response and include the Min-SE header.After that UAC will send a new > > INVITE > > with session-expires and Min-SE returned in the 422 response. > > Now when RE-INVITE send with session-expires less than Min-SE then what > > will > > be the behaivour of the proxy?Again 422 will be send by proxy? > > > > Yes, the situation you describe can happen, if there are multiple proxies > and each of them have a progressively increasing Session-Expires and > Min-SE. > In this scenario, it is possible that the 422's can be generated till it > the > value of Session-Expires and Min-SE are acceptable to all the intermediate > proxies. > > > 2)what is the real use behind the 422 response? > > when INVITE is received with session-expires less than the min-se > > configured > > in proxy then the proxy can modify the session-expires to the min-se > > configured value and forward the INVITE to terminating side and in the > 200 > > OK response the UAC will be indicated with the new session-expires and > if > > parameter refresher=uac, then uac can refresh the session considering > the > > new session-expires.Whether this is possible? > > If this is applicable a INVITE may not rejected. > > A Proxy can not modify the SIP headers. It can only add headers. So, > what > you describe is an optimization, but it is violation of the RFC 3261. > > > > > Pls give your points. > > > > Best Regards, > > Venkatesh > > > > > > On 4/20/07, Manjunath Warad <[EMAIL PROTECTED]> wrote: > > > > > > Please see inline... > > > > > > > > > > > > ************************************************************************** > > ** > > > *********** > > > > > > This e-mail and attachments contain confidential > information > > > from HUAWEI, which is intended only for the person or entity whose > > address > > > is listed above. Any use of the information contained herein in any > way > > > (including, but not limited to, total or partial disclosure, > > reproduction, > > > or dissemination) by persons other than the intended recipient's) is > > > prohibited. If you receive this e-mail in error, please notify the > > sender > > > by > > > phone or email immediately and delete it! > > > > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto: [EMAIL PROTECTED] On Behalf > > > Of venkatesh chandran > > > Sent: Friday, April 20, 2007 4:53 PM > > > To: [email protected] > > > Subject: [Sip-implementors] Regarding SESSION-TIMER > > > > > > Hello All, > > > I have the following queries regarding the SESSION-TIMER handling. > > > > > > -When UAC and UAS are not supporting the SESSION-TIMER,then > > > what will be the behaviour of call-stateful proxy? > > > -Will call-stateful proxy still sends the SESSION-TIMER > > > header in the INVITE that is forwarded to the terminating > > > side with the value configured locally and handles the > > > session-timer? > > > -After SESSION-TIMER has expired the session and dialog > > > details will be deleted in call-stateful proxy and BYE will > > > not be triggered to UAC and UAS.Now how the UA's are > > > informed about the release of the call? > > > > > > Session Timers in proxies are triggered and regulated (in most cases) > > from > > > UA. I mean to say, if UA's support then only proxy session timer will > be > > > activated. > > > > > > Kind Regards, > > > Venkatesh > > > _______________________________________________ > > > Sip-implementors mailing list > > > [email protected] > > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > > > > > > > > > > > _______________________________________________ > > Sip-implementors mailing list > > [email protected] > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
