As a result of the recent BT / Openreach announcement of the end of ISDN / PSTN services, we are looking at the neccessity of migrating to an IP based PBX.
Our current setup is a mix of ISDN and PSTN (2 x ISDN2 - 4 lines total and 2 x PSTN) lines feeding into a Panasonic TDA30 (PBX) + Panasonic TVM50 (Voicemail). Extensions are a mix of approximately 20 Panasonic system phones and 4 analog endpoints. This combination has served our needs extremely well over the years, but the time has come to change…
As a test I have installed Freepbx on an old server that was hanging around, purchased a couple of Yealink T28’s, set it all up with a basic SIP account from one of the many available, and have been extremely impressed with the capabilities that are available.
I have also purchased a Digium analog card for the analog endpoints and a Sangoma digital card for the existing ISDN lines, these are installed and visible within the setup. The Sangoma card is configured as 2 x ISDN TE and 2 x ISDN NT.
Is it possible to insert the freepbx between the incoming ISDN lines and the Panasonic PBX? In other words, can freepbx be configured to pass all ISDN calls (incoming and outgoing) through to the Panasonic?
I hope that this configuration will enable the freepbx configuration to be set up almost seamlessly with the Panasonic. Ultimately the idea is to retire the Panasonic completely and when the ISDN lines are ultimately removed all calls will be over SIP.
Your advice on this would be very much appreciated, and please feel free to say if I am approaching this from the wrong direction!