Hello,
I have managed to configure FreePBX with a SIP Trunk to VoIPRaider. The Inbound Rules redirect to my IVR and when the correct extension was chosen by the caller, my softphone app rings, I can pick it up and hear the other side correctly. They can also hear me.
However, sometimes the IVR picks up the phone, but the caller doesn’t hear any sound. Then calling for a second time, everything works correctly. I also have had the same issue with software of the competition.
Yes, the system is behind a NAT, but when I used a public IP for everything, it didn’t make any difference. Any idea’s where the problem could be and how to potentially solve it?