U could use OPTIONS for keep alive (equivalent of PING).
Regards Ranjit -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Sunil Bhagat Sent: Friday, May 21, 2010 2:02 PM To: 'Satyakumar'; shya...@huawei.com; sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] UPDATE method without any SDP I meant using INFO as KeepAlive message... for refresh purpose... is that not possible? Regards, Sunil -----Original Message----- From: Satyakumar [mailto:satyam_...@hyd.hellosoft.com] Sent: Friday, May 21, 2010 12:27 PM To: Sunil Bhagat; shya...@huawei.com; sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] UPDATE method without any SDP from rfc 2796, sec 2 and sec 1 as below. >From Sec 2 "The INFO method is not used to change the state of SIP calls, nor does it change the state of sessions initiated by SIP. Rather, it provides additional optional information which can further enhance the application using SIP." >From Sec 1 "The INFO method is not used to change the state of SIP calls, or the parameters of the sessions SIP initiates. It merely sends optional application layer information, generally related to the session." Hence it is a general purpose, mid-session (Application) signalling carrying sip method, Not to change any sip session params. Regards, Satya ----- Original Message ----- From: "Sunil Bhagat" <subha...@cisco.com> To: <shya...@huawei.com>; <sip-implementors@lists.cs.columbia.edu> Sent: Friday, May 21, 2010 12:06 PM Subject: Re: [Sip-implementors] UPDATE method without any SDP > Thanks. > > Please correct me if I am wrong, I guess INFO messages could also be used > for the same. > > > Regards, > Sunil > > -----Original Message----- > From: shyam [mailto:shya...@huawei.com] > Sent: Friday, May 21, 2010 11:48 AM > To: 'Sunil Bhagat'; sip-implementors@lists.cs.columbia.edu > Subject: RE: [Sip-implementors] UPDATE method without any SDP > > Hi, > > UPDATE without SDP has many use cases. Couple of them are > > 1) It acts as session refresh if session-refresh parameter are present > 2) IF the caller or callee want to change the contact after the dialog is > established using UPDATE method you can change the same. > > Thanks, > shyam > > ************************************************************************ **** > *********** > 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: sip-implementors-boun...@lists.cs.columbia.edu > [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Sunil > Bhagat > Sent: Friday, May 21, 2010 11:31 AM > To: sip-implementors@lists.cs.columbia.edu > Subject: [Sip-implementors] UPDATE method without any SDP > > Hi All, > > > > I have a small query regarding UPDATE method. > > UPDATE method is used to change the session parameters. I wanted to know, > what is the use of sending UPDATE without any sdp. > > > > Thanks, > > Sunil > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
