I am having an issue where all internal calls are ringing 2 times and going to voicemail. The recipient phone does not ring at all. BLFs do update showing that the phone is ringing, even though it is not. External calls are working perfectly. All phones and PBX are on the same switch and network. The cause appears to be the “retransmission timeout reached on internal calls” which looks like it is typically a networking issue.
Here is a tcp dump of the interface that connects to the LAN on the PBX. It is also limited to a single ip. I placed one internal call and these are the results.
Here is the asterisk log from a similar call.
I did isolate 2 phones and the pbx on a brand new switch. The results were the same. I also moved the main network interface to another available interface and the results were the same.
Any help would be greatly appreciated.