If you are using a PMVS R.5 then your only two options are 2 or 4port.
The PMVS comes standard 2-port without any licence card, but you can install a 4-port lic card to get 4-ports.
You would need a Partner Messaging R.1,R.6 or R.7 in order to have the 6-port option.
Quote by bpitt:
I've seen two systems tied together in an odd way. Take one line port and plug into a station port on the other switch, and vice versa. Then, you have two sets of intercom numbers, 10-25, etc, on two lines. Using ling ring prefrences you could possibly tweak it so that lines ring at both places...kinda hard to explain.
True, you can tie two systems together by crossing ext ports of system A to line ports of system B and vice versa, but the systems will not work as one system as the OP requested.
