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No Audio on Outbound calls | 3CX Forums
https://www.3cx.com/community/threads/no-audio-on-outbound-calls.48325/
I am currently evaluation 3CX before making the transition from Elastix. I have configured the system and done all of the port forwarding on the firewall, and ran the Firewall Check, and everything passes. Audio works fine with incoming calls and calls between extensions, but there is absolutely no sound when making outbound calls.
No Outbound Audio on Outbound Calls | 3CX Forums
https://www.3cx.com/community/threads/no-outbound-audio-on-outbound-calls.67700/
We are in the process of migrating from legacy PBX system to 3CX. I have everything working, except when making outbound calls, there is no audio received by the called number. 3CX Version, Standard Annual 16.0.2.910 Server OS, Windows 10 LTSC w/SimpleDNS Is the 3CX Server Hosted and where...
No Audio on calls in or out | 3CX Forums
https://www.3cx.com/community/threads/no-audio-on-calls-in-or-out.43840/
You might also turn off the Windows or any 3rd party firewall that are installed on the 3CX system and try. If the above is not successful, you should call engin to do a trace on their end. They should be able to tell you if the port you are sending to is the same as the one they put in their Invite SDP.
3CX external incoming calls no sound - VoIP Forum - Spiceworks
https://community.spiceworks.com/topic/2175148-3cx-external-incoming-calls-no-sound
Try adjusting the ports on your Firewall to the new range, then monitor it again. If that doesn't work, then the next best suggestion would be what JayDubinsky said, to run a capture and check the audio streams, or of course contact the 3CX Support Team to help you investigate. Hope this helps! JayDubinsky Anaheim Was this post helpful? Spice Reply
No audio on external calls - Yealink Forums
http://forum.yealink.com/forum/showthread.php?tid=799
No audio on external calls We have an audio problem with a new Yealink W52P phone connected to a 3CX PBX. Calls can be placed from the phone to internal extensions or external numbers, audio is good in both directions and call quality is excellent.
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