Not sure if this is the right forum, but I do have 2 of these 2500 Video phones working perfectly on 2 landlines, that are connected to a modular 1A2 panel. What would I have to do to directly connect these sets to each other so I could bypass CO lines? Never found any reference to using them in an 'intercom-like manner', which is essentially what I want- No CO lines involved, just the 2 sets dedicated to each other for voice and picture. Just wondering....