Hello. I'm posting here as a last effort. I use allworx VOIP for work and I have a C4000BG DSL Modem/router from centurylink. Internet is connected and all my devices function normally except for the work phone. It will not receive inbound calls, but it will allow outbound calls. For a brief time after making an outbound call, it will allow inbound calls, but after a few minutes it is disabled again.
I am no expert, but i've read up on it as much as possible and have run out of options to try.
The details:
Speeds: DSL - 12mb download / 1.5 mb upload / avg ping: 25-50 ms
Greenwave C4000BG modem
I've confirmed SIP ALG is diabled, I've tried forwarding ports (though i'm not sure if I did it correctly). It's hard to identify the problem as I've tried fully disabling modem security as well as both ipv4 and ipv6 firewalls and the problem persists. That makes me question whether it is a firewall issue. Tried toggling dmz. Toggled NAT.
I also have a netgear R6400v2 router from my old setup and I know everything worked with that. I tried setting up the C4000BG in transparent bridging mode, but that proved difficult. I got my PPPoE credentials and logged in on the netgear router, and the wifi worked at that point, but ethernet connections through the netgear router didn't, so I was unable to test whether the phone would work.
My contact at allworx said that if i tried port forwarding I needed to set up as follows:
port 5060 - UDP and TPC
Port 8081 - UDP
ports 15000-15511 UDP
That didn't work either. Nobody on the phone at centurylink has any clue what I'm talking about, and the allworx people say that the problem isn't on their end. If you have ANY ideas on how to fix this, I'd really appreciate the help! At this point i've looked through every setting option on both routers and I'm stumped.
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