I have just started getting a failure to register by my Android Zoiper app. The desktop version works fine as well as a Grandstream softphone I also have installed. I see nothing in the logs that show and attempt at registration.
The Grandstream Wave app is also on the same Android phone.
SBC stands for Session Border Controller
it’s a special device like a firewall for VOIP that sits between the PBX and the network
controlling connections to the PBX
This error message is shown when the server is unable to process the request for some reason, for example when the service you are trying to use is unavailable.
Please make sure all account details and the server hostname are entered correctly.
The issue that you are experiencing might be because the DNS server does not reply at times. (this could be a firewall issue, a problem with Windows o…
I turned on tcpdump. With the Zoiper, I can see no packets arriving at the server at all yet the local VM is receiving packets. When I enable the Grandstream softphone, I can see the packets on my server.
I’ve tried using just my 4G data and not over the wifi. Same thing.
I’ve got another phone I’ll try later.
With the tcpdump, a could see traffic to port 5060 when I would telnet to the server:
Well, wouldn’t you know it? I went out for lunch and while connected to another wifi, it registered. Now I am home and it is still registered. I unregistered and re-registered and it connects.