Have a client that has the IPK II phone system.
It has the 1.61 firmware.

Curious what your experience has been using the PVA card and call quality with the IP based protocol? i could pick up a PVA card rather cheap right now. Is it worth it?

The other option would be to switch phone systems and move them to a Astrisk system. Your thoughts.

Right now they operate a small call center with about 8 extension. However that could be growing soon.