No outbound audio on outbound calls - Inbound fine

[EdisonInfo]

Recently upgraded to v16. Inbound calls are fine, audio in both directions. Outbound calls however have inbound audio but no outbound audio. Using a siptrunk.com trunk.

 

[rgruber]

Verify you have these settings for version 16 in your trunk

3CX Version 16+ – Help Center (siptrunk.com)

 

[EdisonInfo]

I believe the settings are correct. I did have to change a few settings due to the upgrade from 15 to 16. Since the calls are going out just fine I presume the routes etc are fine. Usually no audio is a NAT or port issue. I have UDP ports 10000-20000 forwarded to the pbx. Inbound calls are fine, only outbound has issues. The person we call can not hear us, we can hear them.

 

[rgruber]

What are the 10000-20000 used for? Do you have these ports open. No Nat inbound port forwarding. Nat for outbound

Ports Used by 3CX Phone System - A complete list
Also use TCP 9000-10999 if you are using webmeeting.

 

[YiannisH_3CX]

The easiest way to determine if your port forwarding is correct is to run the firewall checker and see if all tests pass. Run and let us know of the results.
Also the RTP ports that you should forward are 9000-10999.

 

[EdisonInfo]

The easiest way to determine if your port forwarding is correct is to run the firewall checker and see if all tests pass. Run and let us know of the results.
Also the RTP ports that you should forward are 9000-10999.

Yes, the firewall test passes

 

[YiannisH_3CX]

In that case you will need to use wireshark to determine the cause of the issue. You will need to check if the PBX sends audio to the requested port by SIPTRUNK.
If you are not familiar with wireshark then perhaps a 3CX partner could help you determine the issue
https://www.3cx.com/ordering/find-reseller/
Alternatively you could contact your 3CX Partner so they can help you look into it.