Hi all,
This is first time I have to use 79xx series phone with third party IP-PBX but facing SIP registration issue.
Seems that phone is correctly downloading the configuration file and trying to get register with PBX, but it keep sending REGISTER message continuously.
I tried some research on this and found that as phone is not using default source SIP Port viz 5060 (using 49162) however it is expecting response (200 OK) on 5060. IP-PBX is sending 200 OK on received port viz 49162. Phone may not be parsing 200 OK and hence keep re-transmitting REGISTER message.
Did you ever faced the same issue or some other suggestions to identify the issue or just know how to change SIP source port to 5060?
You can download PCAP traces, configuration file and phone GUI status page from following link;
https://www.dropbox.com/s/4pfqxsrslwaor3d/Cisco%207961%20traces.zip?dl=0
- Vivek
