3CX - Dropping Audio on External Phone Calls

[mQhBslCoVthWi7P]

Hi our system here is dropping audio on external phone calls. The phone will ring once then go silent.

I can see plenty of other 3CX people on your forums with the issues on here, but no one has got their solution added to double check against.

Any advice will be welcomed.

The system here is 3CX (on Prem) Version 20.0 Update 5 (Build 551 Release)

Cheers
Mike

 

[fortech]

Hi Mike, I think I just replied to a ?related question? in other thread you posted recently. The suggestion there is more or less relevant. (ie, maybe need to investigate the SIP trunk provider service). And. Otherwise, if you can clarify,

note that inbound calling vs outbound calling can have different success-fail issues
(ie, calls from outside world to your PSTN/DID numbers // vs calls from your 3cx extensions to outside world phones?)

also internal calls vs external calls - will help debug where a problem might lie

for example, if you can successfully place a call between 2 internal extensions in your 3cx system
then probably 3cx is working ok
and call drops are related to SIP trunk / connection to outside world
(if for example - inbound calls come into system but the drop? or outbound calls are completed but drop after a few seconds? or dead air? etc.)

it could also be helpful if you give a bit more detail about your setup, and the tests you have done, and things that do work / and things that don't work

ie, softphone vs physical deskphone?
SBC deployed for physical phones? (probably not if your 3cx instance is on-prem / same network as physical deskphones?)
etc.

Tim