No audio on internal calls

FreePBX Endpoints
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1

Hello!

I got a freepbx (FreePBX 17.0.19.24, Asterisk Version: 21.5.0) here
It’s running for 3 months now. So far we did not have any issues.
Today I we got the following problem:
There is no audio on internal calls in both directions. If you put the call on hold for a second audio starts working.
The issue only occurs if both participants use a snom wired device (We have 50% Snom wired devices and 50% Snom DECT phones attached by Snom M900 IP Dect Stations)
So if one participant uses a DECT phone everything is fine.
No problems if it is an oubound or inbound call.

I will do a restart of the VM running freepbx and asterisk tonight.

Is there anything I can do to narrow it down?

Thanks in advance.

Gerald

2

Howdy! Welcome to the forums.

Generally, this sort of audio outage stems from incorrect UDP port mapping for RTP media – possibly your hypervisor/VM infrastructure is not passing these thru 1:1 to the internal FreePBX VM eg. it is rewriting them to other ports. You might try to double-check your IP, NAT, and related networking settings.

Please also consider posting anonymized logs to the FreePBX pastebin if this continues.

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5

Thanks for pointing me into the right direction. It was a network issue indeed. Originally I just opened SIP on my firewall between the server and the snom phones. The DECT phone are in another subnet with a less restrictive ruleset. Final solution was to add the ports 10000-20000 to all subnets where the snom phones are.
The only thing that it really strange is that it was working for a while without these ports opened. Thanks for pointing me into the right direction. It was a network issue indeed. Originally I just opened SIP on my firewall between the server and the snom phones. The DECT phone are in another subnet with a less restrictive ruleset. Final solution was to add the ports 10000-20000 to all subnets where the snom phones are.
The only thing that it really strange is that it was working for a while without these ports opened and that external calls also worked without any problems.

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