@johnprogers wrote:
I have a strange problem with a customer at the moment. Everything worked until 3 days ago, when inbound audio on external calls stopped working for them.
Setup is SIP trunks to a FreePBX 13.0.192.16 distro hosted on Vultr.
The customer has Grandstream IP phones on their site.
I have a Sangoma Phone in my office, hanging off the same system.Calls from the SIP trunk to their office exhibit no inbound audio. The audio from the clients office out is fine.
If I add my office phone to their ring group and call their number, then audio is two way.
If they divert their call flow to a mobile, then the audio is two way, so the SIP trunks must be fineAt this stage you will say this must be their firewall. however I can ring from my office to their office using extension numbers and the audio is fine.
There is a second customer also hanging off this same server who have no problems whatsoever.
I have trusted their office IP in the responsive firewall in case this made a difference, but it doesn't (didn't think it would).
Is it definitely firewall, or could it be something else?
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