just installed the Zyxell modem; turned off the firewall features;
unticked the DHCP option 125
This is the sole & main router in the network
All my voip phones continue to work but my work phone; which I guess is more "secured" (not too sure but I think its tls 1.2)
It simply wont register (its got an IP just fine, I can ping 188.8.131.52 with the built in tool, etc.)
If i replace the router with my good old DIR-825 running DD-WRT;
all is well.
Problem is my dir825 is quite old, and wanted to leverage better Wifi performance of the Zyxell.
Any ideas ?
Go to Solution.
I see REGISTERs being sent out from the device; nothing coming in (from the LAN side of the router)
on the WAN side - you can clearly see the challenge back from the VOIP server; which sadly, never makes it on the other side of the router.
So... its useless.
We would like to check this with you and we sent you a private message to get your contact information.