- V18 Update 3 Build 450
- Remote hosted on GCP
- Firewall test passes
- Handsets are Yealink T21P with up to date firmware
- Phones provisioned by STUN with unique SIP and RTP ports
- Local network firewall is a Unifi Security Gateway. Not recently upgraded, no firewall rules changes.
- No local port forwarding
- Phones get IP by DHCP
Suddenly we have no incoming audio on extensions using physical handsets. Calls on web clients work properly. I have never had port forwarding rules on the firewall and I haven't updated my firewall firmware recently. 3CX was updated a week ago which may have been the start of the problem and just not noticed as we only have a few extensions on handsets and they've mainly been working from home. Were there any changes to the most recent update that may have caused this?
- Remote hosted on GCP
- Firewall test passes
- Handsets are Yealink T21P with up to date firmware
- Phones provisioned by STUN with unique SIP and RTP ports
- Local network firewall is a Unifi Security Gateway. Not recently upgraded, no firewall rules changes.
- No local port forwarding
- Phones get IP by DHCP
Suddenly we have no incoming audio on extensions using physical handsets. Calls on web clients work properly. I have never had port forwarding rules on the firewall and I haven't updated my firewall firmware recently. 3CX was updated a week ago which may have been the start of the problem and just not noticed as we only have a few extensions on handsets and they've mainly been working from home. Were there any changes to the most recent update that may have caused this?
