Had our FreePBX server running for a couple of years now with no real issues. For some reason in the last few days, when we dial out to numbers with 1300 XXX XXX, or even just 13 XX XX, we get dead air. The call appears to answer, but I can’t hear anything.
I get the following in the asterisk logs.
[2019-09-26 11:56:43] NOTICE chan_sip.c: Disconnecting call ‘SIP/0282432310-00000260’ for lack of RTP activity in 31 seconds
The strange thing is calls to any other number format work just fine. Not sure what to look at. I’ve tried deleted and recreating the outbound route for the problem numbers but that didn’t help. Also checked the firewall to confirm that RTP 10000-20000 is allowed.
Any thoughts on where I should look next?