I have a Google Cloud hosted 3CX instance.
Linux OS.
License is Standard Annual 16.0.5.619.
Provisioned using 3CX's automated tool.
The Firewall checker has passed.
I have three sites all connecting to the same instance via SBC's.
Raspberry PI 3B+, with latest Rasbian OS and SBC software installed per 3CX instructions.
All Rasberry PI's are complete CanaKit Kits with approved power supplies and SD Cards, etc.
12 Yealink phones at the main site.
2 Yealink phones at each of the smaller sites.
Everything worked fine for the first 7 months of install. Problems have only appeared in the last couple of weeks.
The main site still connects fine and is stable, it handles the majority of the call volume.
The biggest problem is at one of the smaller sites. Calls last under a minute before being dropped, or more often, the remote caller can't hear, but they can hear the caller on the onsite phone. On the status page for the SBC, the "UDP status" routinely cycles between Up and Down.
The third site has limited call volume (the users there prefer the phone app), and I'm not getting complaints. But, the status page for that SBC is exhibiting similar "UDP down" behavior, so I suspect it has a similar issue that is just not being reported.
I've seen other posts where it's suggested this is a firewall issue, but my cloud-hosted instances firewall was automatically configured (and has one SBC that is rock solid). So I suspect it is related to conditions at the remote site. My understanding was that no firewall configuration was necessary at remote sites when using SBC's.
I was just told (literally as I typed this) that their IT company installed new firewalls at both the sites experiencing problems. So now I am *really* suspicious that is the issue. But, I've got no details on what firewall accommodations need to be made at the SBC site (I thought it was none). What might be happening here?
Linux OS.
License is Standard Annual 16.0.5.619.
Provisioned using 3CX's automated tool.
The Firewall checker has passed.
I have three sites all connecting to the same instance via SBC's.
Raspberry PI 3B+, with latest Rasbian OS and SBC software installed per 3CX instructions.
All Rasberry PI's are complete CanaKit Kits with approved power supplies and SD Cards, etc.
12 Yealink phones at the main site.
2 Yealink phones at each of the smaller sites.
Everything worked fine for the first 7 months of install. Problems have only appeared in the last couple of weeks.
The main site still connects fine and is stable, it handles the majority of the call volume.
The biggest problem is at one of the smaller sites. Calls last under a minute before being dropped, or more often, the remote caller can't hear, but they can hear the caller on the onsite phone. On the status page for the SBC, the "UDP status" routinely cycles between Up and Down.
The third site has limited call volume (the users there prefer the phone app), and I'm not getting complaints. But, the status page for that SBC is exhibiting similar "UDP down" behavior, so I suspect it has a similar issue that is just not being reported.
I've seen other posts where it's suggested this is a firewall issue, but my cloud-hosted instances firewall was automatically configured (and has one SBC that is rock solid). So I suspect it is related to conditions at the remote site. My understanding was that no firewall configuration was necessary at remote sites when using SBC's.
I was just told (literally as I typed this) that their IT company installed new firewalls at both the sites experiencing problems. So now I am *really* suspicious that is the issue. But, I've got no details on what firewall accommodations need to be made at the SBC site (I thought it was none). What might be happening here?
