Help! I’m completely stumped, and I don’t have a fix – nor does the Voxilla forum!
I’m running Asterisk 1.4.21.2 on a small (Pentium 4 3GHz/2GB RAM) SOHO server with 4 SIP channels. OS is Fedora 8. The box is also the main NAT router for the LAN and Asterisk has a direct Internet connection. The ISP provides a sustained 10-12Mb down 1.5-2 Mb/up.
For some time, 99% of the SIP providers I’ve used have random audio dropouts 5-10 seconds in length. I usually can’t hear the other side. Two are exceptions:
- Adams Telecom (Had to drop them for other reasons)
- Voipjet
I can make calls just fine, and even with SIP to SIP calls, I have dropouts. (No provider trunk.)
- Nothing shows in the logs, nothing shows in the /var/adm/messages
- No disk or network errors are found
Just to further diagnose it, I took a SIP phone (SPA941) and set it to directly use a SIP termination provider. This same provider is also used by the Asterisk server.
- If the phone uses the SIP provider directly, no dropouts
- If the phone goes through the Astersk server, I get 5-10sec dropouts
It can’t be firewall software (or at least its’ unlikely) because the SIP phone uses the same gateway. I’d think that rules out the hardware.
- How do I further diagnose this issue?
- How do I solve it?