On Sun, Jul 11, 2010 at 11:27 PM, <sunilkumar.ve...@wipro.com> wrote: > Hi, > > Its not mandatory as it may flood the network with Re-invites or > Updates even in valid call scenarios which are running for quite a long > time. > I could see that as the main reason.
How can this happen? How does the Expires header trigger re-INVITEs ? > > Also if we are using TCP as transport we can build TCP based "Keep > alive" mechanism. > > Session timers are mainly useful for proxy when UDP is the transport. I am not talking about a session timer. I am talking about the Expires header. I am not talking about re-INVITE. > > From UAC/UAS(endpoints) it will not be a major issue as they can clear > off the transaction when user disconnect. > After all user will be aware of there is some one responding at the > other end or there is silence. > > Hope I have answered your question. No. Perhaps the question was unclear. > > > Regards > Sunil Verma > ESN: 877-5050 > Ph: +919731245000 > > > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu > [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of M. > Ranganathan > Sent: Sunday, July 11, 2010 1:57 AM > To: sip-implementors > Subject: [Sip-implementors] Expires header. Why not mandatory for > DialogForming INVITE > > Hello, > > I am wondering why it is not mandatory for the UAC to attach an Expires > to a dialog forming INVITE. It would seem useful for at least a couple > of things: > > 1. Stack can know when to tear down a "dead" transaction which is stuck > in Proceeding state. > > 2. Downstream proxy can know what the max fork expiration time can be. > > It would seem useful to make this a mandatory header for a dialog > forming INVITE and yet it is not. Just wondering why. > > Ranga > > -- > M. Ranganathan > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > Please do not print this email unless it is absolutely necessary. > > The information contained in this electronic message and any attachments to > this message are intended for the exclusive use of the addressee(s) and may > contain proprietary, confidential or privileged information. If you are not > the intended recipient, you should not disseminate, distribute or copy this > e-mail. Please notify the sender immediately and destroy all copies of this > message and any attachments. > > WARNING: Computer viruses can be transmitted via email. The recipient should > 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 > email. > > www.wipro.com > -- M. Ranganathan _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
