It depends on the UAS. Do you use a certain UAS or are you developing one?
A bad, simple, dumb UAS will reject the second call/message.
An good, intelligent, smart UAS can deal with multiple calls and multiple IM implementations. Thus, it will accept the MESSAGE, regardless if it is session-model (INVITE-MESSAGE-MESSAGE-BYE) or page-model (MESSAGE).
Thus, there is no right or wrong. It depends on how smart the UAS is, and which IM models are supported by the UAS. Nevertheless, this is a plain end-to-end problem and does not involve the SIP proxy.
regards, klaus
Abhijit A.Mahajani wrote:
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@pernau.at To: "Klaus Darilion" klaus.mailinglists@pernau.at Cc: "Abhijit A.Mahajani" abhijit_m@citilindia.com; "ser users" serusers@lists.iptel.org Sent: Tuesday, July 26, 2005 3:43 PM Subject: Re: [Serusers] Queries regarding SIP IM
Klaus Darilion wrote:
Hi!
- Please always Cc: to the mailing list - others might also be
interested in this topic and may help you.
You did. Sorry, my mistake.
klaus