voip on a ugs20vpn router

baudetd · June 2023

hello

since last update 5.36 of UGS20 vpn router

I have VoIP problems

is this a known bug?

thanks

DeanH · June 2023

Just to clarify, are you using a USG20-VPN or a USG20W-VPN model? As of firmware version 5.20 this changed to USG FLEX 50 or USG FLEX 50W, respectively.

baudetd · June 2023

it is the
USG FLEX 50 (USG20-VPN) model

DeanH · June 2023

Ok. I don't have any of those, but if it was the USG FLEX 50W (USG20W-VPN), we have a bunch (approximately 100 or so) in the field and they are working fine for our VoIP services after upgrading.

baudetd · June 2023

I have a voip voice problem, the voice does not pass from outside to inside

DeanH · June 2023

Do you have an on premise system that connects to the server, or just a phone that connects to a server in the cloud?

Do you see any entries in the log showing a blocked connection attempt from the phone provider?
That is found at Monitor > Log. Clear the log first, then make a call and see if it shows in the log as a DROP.

Have you run a packet capture during a call to catch both WAN and LAN1 (or whichever you are using) ports? That can be done at Maintenance > Diagnostics > Packet Capture > Capture.

Do you know how to use Wireshark to look at the packet capture (PCAP)? If so, you should see first the signaling from the phone/phone system using Session Initiation Protocol (SIP), then the audio using Real-time Transport Protocol (RTP).

If you have an on premise system, it also matters whether it connects via registration or not. If it does not register to the server (unregistered SIP trunk), then you will need port forwarding, or Network Address Translation (NAT), rules in place.

But, I like to start with the packet capture to see what is coming in to the WAN and whether or not it is going out to the LAN.