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T38 enables you to send a fax over a data network (FoIP). It is needed because fax data can not be sent over an IP network in the same way as voice communications.
CNAM pairs caller data and see the name and number of the person calling you. It is very similar to caller ID except that both the caller’s name and the calling number are displayed on the receiving end of the phone call.
Route calls evenly between two endpoints automatically.