1. A method for remote loopback testing in MGCP or NCS protocol, comprising the steps of: (a) attaching a tag to the phone number of an analog port on a multimedia terminal adapter located at one end of a communications network; (b) pre-configuring a switch for controlling the loopback connection setup between the adapter and a test probe located at the opposite remote end of the communications network; (c) initiating connection by the probe by dialing a tag+telephone number corresponding to a loopback mode and a port on the adapter; (d) translation of the tagged loopback mode by operation of the switch; (e) correlating the phone number with the operation of the IP address of the adapter; and (f) sending the signaling information back to the probe in an appropriate format.