Problemes amb l'àudio utilitzant telèfon 4g

FreePBX Networking
1

Hello,
I have a FreePBX 16.0.40.7 ‘VoIP Server’ installed, which I only use for the SIP PBX. It’s working on the LAN, and I don’t have any problems. The issue arises when I want to make a call with a phone outside of the LAN using 4G.

I’ve opened port 5060 UDP and done a DNAT, the device registers correctly and calls go through, but I have a problem with the audio that doesn’t work.

I’ve seen that I should open the RTP ports from 10000 - 20000 UDP for the audio to work, but when I open the port and do the DNAT, should I send it to the PBX or the phone?

I’m not sure if I’ve explained it correctly.
Thank

2

To the PBX. The router should be doing SNAT towards the phone, typically done by SNATing all locally originated outgoing UDP to all destinations.

3

Hello, Thanks for the response.
I have opened the ports on the router, and when I test the sound by calling *43, it works. However, the problem is when I talk on one phone; the other phone cannot hear me, but the reverse works. I don’t know if it’s a phone configuration issue or the router’s ports.

4

This can happen if you haven’t set the right external media address.

5

How is it configured?

6

It’s possible that it isn’t controllable separately from the external signalling address, via the GUI:

https://community.freepbx.org/uploads/default/original/3X/c/a/cafc35bee513bdf79007b1f14118a9214dc6306b.png