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
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