Hi,
A kx-tva is the same as a kx-tvm, it just depends what country you are in. They connect to the phone system i.e. kxtda, kxtde or ncp via a digital proprietary phone port which gives you two voice channels between the two units and all the handshaking. The ivr is programmed using custom service menus of the kx-tva/kx-tvm. Or as the guys have said above get the esvm card to go on the tda, tde or ncp.
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