[Serusers] More Queries regarding SIP IM

Hi! Please see if my problem statement is clear from following or not? Consider Windows Msgr specific case first: UAC 1 has established a voice call with UAS through SIP Proxy. UAC1---INVITE------>SIP Proxy------>UAS SDP=Audio/Video Now UAC1 wants to send IM to UAS UAC1---MESSAGE------>SIP Proxy----->UAS My Question is Now what should UAS do? When seen in ethereal, we see INVITE again from UAC1 with SDP=x-ms-message. If UAS supports SINGLE INVITE then, It ignores these INVITE and IM is not processed. Should UAS process the seocnd INVITE also? Consider a case where Voice call is established other than Windows Msgr. UAC1-----INVITE----->SIP proxy---->UAS some other UAC e.g. UAC2 wnats to send IM to UAS (Not from Windows msgr) UAC2-----MESSAGE--->SIP Proxy---->UAS then Now this SIP IM is sent from Other UAC (Not from Windows msgr).Which does not send INVITE with SDP=x-ms-message It simply sends SIP MESSAGE. Now here my question is Will UAS process this SIP MESSAGE? Because Both Call ids are different . Thanks and Regards. Abhijit ----- Original Message ----- From: "Klaus Darilion" <klaus.mailinglists(a)pernau.at> To: "Klaus Darilion" <klaus.mailinglists(a)pernau.at> Cc: "Abhijit A.Mahajani" <abhijit_m(a)citilindia.com>om>; "ser users" <serusers(a)lists.iptel.org> Sent: Tuesday, July 26, 2005 3:43 PM Subject: Re: [Serusers] Queries regarding SIP IM