Evening All:

KX-NCP500 with IP phones on premise. Working fine. Customer would like to add one IP phone at an off premise office (home office). I have access to the firewall to open ports as needed (or port forward)

I can get the phone to have date & time on the display at the off premise end, call a phone & ring it at the premise end, ring when called at the off premise end. I can't get any audio to pass thru either direction.

Factory support says it the NCP500 must have a VPN for the off premise phone to work.

Has anyone found a way to get it to work without a VPN?

Thanks in advance. Edward

Edward