SIP Phone can register with Cisco Call Manager but can not call
I am having problem with SIP Phone and Cisco Call Manager 7.1. It can register with Call Manager, when SIP phone call to CIPC, it is working. but when CIPC call to SIP phone, it's ringing, when pressing answer button, it could not be connected...the call is dropped.
When I use wireshark to capture SIP packet, I saw the reason Q.850 cause 65 Bearer capability not implemented. then ICMP Error (Port unreachable). I have also attached the capture packet file. I am suspecting the codec mismatch. Cisco Call Manager is configured MTP preference as G711ulaw and could not change it.
Packet 1 is call successfully when SIP Phone (192.168.1.145) call to Cisco IP Phone (192.168.1.143).
Packet 2 is call unsuccessfully when Cisco IP Phone (192.168.1.143) call to SIP Phone (192.168.1.145).
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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