Digital phone vs. ComSwitch. Will it work?

Nothing out of my post on "hardware" so maybe? We want to switch over to a digital phone via Time Warner Cable. We now use a Command Communications Comswitch 7500 on our land line to switch incoming calls either to phone, fax or answering machine. Will it still work on a digital phone hook up? Time Warner has no clue and the ComSwitch manufacturer may be out of business. Help.