I appear to have this strange problem, but I am not sure where the problem is coming from. Sometimes, when I receive an incoming call from outside, the phones in the ring group ring in a 3 second loop with the caller ID showing as 100115. I don’t know why this is happening and I am not sure if it’s something at the FreePBX level or the Grandstream HT813 which I use as a PSTN gateway.
I have no idea what 100115 is either and it doesn’t show in the call event on FreePBX. On FreePBX, it shows the actual caller ID with 10 2-second calls with no caller ID?
Thank you for getting back to me. It would be long enough, but the problem is that it doesn’t always happen so trying to replicate this whilst having a capture running would probably be difficult. Would you think if I kept a syslog running 24/7, capturing everything, that I could then use that?
So it would be common for me to keep a tcpdump running for days or weeks on a PBX when I am troubleshooting a weird issue so I can go back and pull a trace when an end user reports it after the fact and it’s helped me resolve so many hard to diagnose problems. For example, it’s fascinating seeing the SIP traffic when a phone crashes during an incoming call when it’s supposed to be ringing.
I also typically capture only SIP traffic to save on storage space as most of the time I don’t need the audio of the call to fix problems like this.