Agent Voice not Leaving VICIbox Server for most of the calls

[medk]

Hello,

Since I installed VICIbox 8.1.1, there are plenty of calls where:
- In my server recordings, the customer is clearly heard, the agent is clearly heard.
- In the VOIP provider recordings, the customer is clearly heard, the agent is MUTED.
Most of the calls are like that.

We are working on a Manual Outbound Campaing, The codecs are the same allowed by the Voip provider (alaw and g729) with 20Mbps optics fiber connection.

I'm using:
disallow=all
allow=alaw
which is the same carrier configuration before I switched from GoAutodial 3.3
With GoAutodial 3.3 I never faced this problem.

Now I added:
disallow=all
allow=alaw
allow=g729
And still the same problem. It started with the switch to VICIbox.

[Kumba]

one-way audio is almost always a router or NAT issue.

[medk]

one-way audio is almost always a router or NAT issue.

It's not 100% of the calls, it's about half the calls.

I disabled call recording and the problem is gone forever. I don't understand why because with GoAutodial, call recording does other things like system delay, bad sound quality...
Here it didn't do all of that but it caused half the calls with one-way audio.