Unifi USG Configuration?

[Luke Burns]

Hello all,

I setup a new 3CX box in a Ubiquity Unifi environment. I am having trouble with only getting one way audio on internal/external calls. Everything I read online says to disable the SIP setting in the Firewall Conntrack settings which does make the firewall test pass, but I still have one way audio. Anyone have any other thoughts?

 

[Saqqara]

Need more info on your setup https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/


Have you opened all the required ports as per https://www.3cx.com/docs/manual/firewall-router-configuration/

 

[Luke Burns]

• 3CX Version, e.g. Standard Annual 16.0.525
• Server OS, e.g. Debian 9
• Is the 3CX Server Hosted and where? Local onsite
• IP Phone Make/Model/Firmware: Snom 760's
• Provisioning Method: STUN
• Trunk Provider or Gateway Make/Model: Twilio
• Has the Firewall Checker passed: YES
• Are custom Phone Templates being used: NO

I have opened all the required ports and firewall test passes, but still the one way audio. Outside of my network (using the soft phones) calls work properly.

 

[cobaltit]

So your phones and 3CX are onsite yet you have the phones configured as STUN?

 

[JohnS_3CX]

Hi Luke

There are audio ports dedicated to sending and receiving the RTP stream, which if blocked somewhere along the line will cause the issue you described (even with a passing fw checker).

If the phones are on the same site as the PBX, it's a good idea to provision a couple as "Local" rather than STUN and see if that helps solve the issue when calling between them and through your trunk.