Thanks, the example was the exact scenario. I have a related question. Typically, for an agent in the pre-SIP world, the switch would provision a special line as an agent, and an agent phone would typically have two lines, a personal line and a call center line. In that case the switch knows what call it is sending to the phone and hence can update its displays accordingly (e.g. "Missed call" etc.). If this happens to be a SIP line, is it possible for a UAS figure out what type of line it has received a call and to modify behaviour accordingly?
Kedar On 4/12/06, Paul Kyzivat <[EMAIL PROTECTED]> wrote: > > Take a look at RFC 3326 - the Reason header. It even has an example > covering your case. > > Paul > > 이성우 wrote: > > Dear, > > > > I am implementing a Group Ring facility in a small-sized IP-PBX system > that uses > > 3 user agents internally. I wonder how I can mark a group ring INVITE > message to > > differentiate other normal INVITE message? This is for clearing 'missied > call' log > > at all other user agents except for the one that actually received the > call. > > > > Current Scenario is as followings. > > > > 1. Each user agent in IP-PBX system is set to a group ring function. > > 2. There comes a SIP INVITE message from outside to IP-PBX system. > > 3. IP-PBX system forwards the INVITE message to each user agent that are > in the same ring group. > > 3. Each 3 user agent makes a ring responding 180 message each. > > 4. One user agent receives and send 200 OK back to the caller (IP-PBX > system). > > 5. Now that IP-PBX knows it received an answer from a user agent, it > sends CANCEL to other user agents. > > 6. Each of the 2 user agents process the CANCEL message leaving 'missed > call' log in its LCD window. > > > > > > > > Caller UA IP-PBX UA1 UA2 UA3 > > | INV | | | | > > |----------------->| INV | | | > > | |--------------->| | | > > | | INV | | | > > | |----------------------->| | > > | | INV | | | > > | |------------------------------>| > > | | 180 | | | > > | |<---------------| | | > > | | 180 | | | > > | |<-----------------------| | > > | | 180 | | | > > | |<------------------------------| > > | | 200 | | | > > | |<---------------| | | > > | | ACK | | | > > | |--------------->| | | > > | | CANCEL | | | > > | |----------------------->| | > > | | CANCEL | | | > > | |------------------------------>| > > > > > > My questions are > > Q1. How can I let the user agents know that the incomming INVITE message > is group-call? > > Q2. If I use a specific SIP Header in the INVITE message (from IP-PBX to > UAs) to carry > > the group-call infomation, what header should I use and how? > > Q3. Can I use the specific SIP Header in CANCEL message instead of > INVITE for the same purpose? > > > > Thanks in Advance. > > > > > > > > Lee, Sungwoo > > > > OfficeServ Development/VoIP > > Telecommunication System Div. > > Samsung Electronics Co., LTD. > > > > [EMAIL PROTECTED] > > TEL: 82-31-279-4329 > > FAX: 82-31-279-2296 > > Mobile: 82-10-3015-4329 > > > > _______________________________________________ > > 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
