Hi Radha, A Session Timer refresh is a better option to check whether a SIP session is alive or not. Because OPTIONS can be sent outside a dialogue too.A session timer re-INVITE/UPDATE will always be sent within a dialog, so its response is the most reliable way to determine whether a session is on or not.In fact session timer extension was designed to address this issue. You can go through RFC 4028 to see how it exactly works.
Regards, Veechi Jha Project Engineer Mobile and Consumer Electronics Wipro Technologies +91-80-28520408-7086 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Radha krishna Sent: Wednesday, November 26, 2008 9:49 AM To: sip-implementors@lists.cs.columbia.edu Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: [Sip-implementors] Session Timer Vs OPTIONS ping Hi Which one will be better approach for checking the SIP session is still active or not? Session Timer or OPTIONS ping. And Why? Regards S.Radha krishna _______________________________________________ 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 _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
