Hello, still new to the whole pbx arena and I need to upgrade my Nortel option 11c. We currently have 20 extensions on one of our floors and we aquired a new floor that has no phones. I need right now about 4 more extensions but would like to plan for the future so I am looking to actually add a card that would allow us to have 20 more extensions........If any one knows the model number of the card I need it would be of great help.........right now the model numbers I have are NTMW05aa and NTMW04aa and I don't know which one is the one that would add the extensions. Thanks in advance
