No audio on incoming calls on remote extension

[DanOvery]

Hi,

Tearing my hair out with this. Outgoing calls from a remote extension work absolutely fine, but there is no audio on incoming calls. (Hosted 3CX instance). Below is the remote end firewall setup:

https://ibb.co/cekZjJ

Here is the phone setup:

https://ibb.co/mZf0PJ

But, I do notice the end message in the log. Not sure how authentication can't be working if outgoing calls are OK?

https://ibb.co/b2VdBy

 

[Saqqara]

How many extensions do you have at the remote end - more than one using stun you need to config each on differently - https://www.3cx.com/community/threa...etgear-nighthawk-x4s-d7800.54620/#post-225296

If you have a few devices, you maybe better off installing 3CX SBC

 

[DanOvery]

Thanks for your reply, but I only have one at the moment. (testing at home before deployment - not going well!)

 

[eddv123]

Hi DanOvery,

Try following this guide for Direct STUN setup with 3CX:
https://www.electronicfrontier.co.uk/provisioning-remote-phones-using-rps-direct-sipstun/

Most importantly ensure you have the setting "PBX deliveres audio" enabled on the extensions themselves.

The ports you need configuring through your firewall can be found here:
https://www.3cx.com/ports-used-3cx-phone-system-v14-v15/

 

[YiannisH_3CX]

Hello @DanOvery

Is there no audio in both directions or are you experiencing one way audio? As above make sure that the SIP and RTP ports and forwarded to the local IP of the phone and try again.

 

[leejor]

Does the 3CX firewall test complete successfully?

In some cases, the router used at the remote end can make a difference, some are able to handle the voice packets better than others. Are there any other SIP devices used at the far end, built into the router perhaps?

 

[Alphabetic]

Hi!

Make sure SIP ALG is turned off on remote router.

on PBX check the extension settings for local SIP and RTP Ports.

On your remote router give your phone a static IP and port forward your local SIP and RTP ports specified in EXT settings on the PBX.

I would maybe lock down the firewall to accept these packets from your 3CX IP only as sometimes you can end up getting ghost calls.