Connecting KX-NT321 over HUAWEI B525 gsm router

[Lezcarr]

I am having an issue with my nt321 it registers and loads and works fine for a few minutes then you loose the button functions, the display still shows the handset ext number and name but that’s it, you have to unplug and reload again, but still same issue arises.

Any pointers would be greatly received

Setup is NT321 connected to HUAWEI B525 GSM router connecting via wan to a remote NS700

 

[obtsystems]

The NT 3xx doesn’t support media relay, it would have to be an NT5xx phone