When a phone sends a 180 Ringing message to CallManager, does that mean the phone is actually ringing at that time?
I realize this may be an obvious question, but I need to be sure. We have a 3rd party Call Center solution with CUCM 10.5 and Cisco 8851 phones. The Agents are complaining of missed calls, but the phone never rings. The Call Center solution is off-site, and there is no CTI integration. Calls are simply forwarded through the PSTN to the Agents.
I am using RTMT to look at the SIP ladder diagram. I can clearly see the call coming in from the CUBE gateway, hitting CUCM, and sending an INVITE to the phone. The phone responds with a 180 Ringing message. A few seconds later, I can see the phone send a 200 OK message when the Agent answers the call.
So my questions are:
1. When a phone sends a 180 Ringing message to CallManager, does that mean the phone is actually physically ringing at that time or is it just a generic signal?
2. Have you ever heard of any bugs with 88XX phones with 12-5-1SR3-74 firmware where the phone does not ring or has a delayed ring?
3. When I look at the SIP ladder diagram, at what point does 2-way audio start?
Thanks, Randy
