Solved One way audio

[ZeIRO]

Hi, I installed 3CX on my company server, all of functions work fine, or external sip account work only one way audio. I used phones SPA303-G2, Server is Windows server 2016, and router is TL-ER5120. SIP provider is Slovak Telecom. from slovakia. Thanks for answer.

 

[ZeIRO]

Works!!

Nedd to forward port for 9000 to 9255 (UDP)
no 9049!!

 

[YiannisH_3CX]

Glad to see the issue is resolved and thank you for updating the post