There is a provision for a 3rd party to initiate REGISTER requests, as long as that 3rd party is authorized to do so. The To: and From: headers are different in this case. The To: header will carry the AOR being queried. The From: header will carry the AOR of the 3rd party. If you want to use this as a query mechanism, you'll simply not include the Contact: header in the REGISTER request.
Using 3rd party REGISTERs to query location information has a fundamental drawback, however. It is a 'pull' model, where the 3rd party must periodically pull the information down from the Registrar/Location Service to keep in sync. SUBSCRIBE/NOTIFY, on the other hand, is a 'push' model. In this model, the 3rd party is notified everytime there is a change in the AOR-Contact bindings of interest. Rajnish -----Original Message----- From: Sarju Garg [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 07, 2006 9:23 AM To: Rajnish Jain; 'Nataraju A B'; 'SIP-implementors mailing list' Subject: Re: [Sip-implementors] Query Regarding Register Message Is it possible to use REGISTER message to query the subscriber location. Regards Sarju # 9810304396 ----- Original Message ----- From: "Rajnish Jain" <[EMAIL PROTECTED]> To: "'Nataraju A B'" <[EMAIL PROTECTED]>; "'Sarju Garg'" <[EMAIL PROTECTED]>; "'SIP-implementors mailing list'" <[email protected]> Sent: Wednesday, June 07, 2006 3:54 PM Subject: Re: [Sip-implementors] Query Regarding Register Message > You may want to look at RFC 3680. > > Thanks, > Rajnish > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Nataraju A > B > Sent: Wednesday, June 07, 2006 5:43 AM > To: 'Sarju Garg'; 'SIP-implementors mailing list' > Subject: Re: [Sip-implementors] Query Regarding Register Message > > Comments inline... > > Thanks & Regards, > Nataraju A.B. > >> -----Original Message----- >> From: [EMAIL PROTECTED] > [mailto:sip-implementors- >> [EMAIL PROTECTED] On Behalf Of Sarju Garg >> Sent: Wednesday, June 07, 2006 9:18 AM >> To: Sarju Garg; SIP-implementors mailing list >> Subject: [Sip-implementors] Query Regarding Register Message >> >> Hi all, >> >> Can a UAC know the other contact information of another UAC using > REGISTER >> message? >> > > [ABN] Basically the LS query gives the registered contact addresses of a > particular URI, but this service may not be available to end user... > this LS query been generally applied by the inbound proxy to route the > incoming requests to the end users in the respective domain. > > [ABN] I feel SIP does not provide a service to end user of finding the > contact address of any other user, Any user can find his OWN registered > contact addresses but not others contact addresses. > >> Also, would like to know if there is a way to locate a subscriber > using SIP >> messages >> > > [ABN] approximately OPTIONS message can be used for this purpose.. > >> Regards >> Sarju >> # 9810304396 >> >> _______________________________________________ >> 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 > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
