System for multiple voice lines with data over a single subscriber loop

A system for multiple derived voice lines over a subscriber loop for use in a telephone network, said system comprising:

• a line interface adapted to connect to a subscriber loop having an active telephone instrument connected thereto, and operable to receive over the subscriber loop voice packets comprising digitized voice data from the active telephone instrument;
• and
• a voice interface adapted to connect to the telephone network over a digital network connection, and operable to receive said voice packets from said line interface, to extract said digitized voice data, and to transmit said digitized voice data over said digital network connection;
• wherein:
• the telephone network includes a source of a network timing reference signal;
• said voice interface is further operable to receive a first timing signal over said digital network connection that is synchronized to the network timing reference signal, and to transmit said digitized voice data in synchronization with said first timing signal, and further operable to generate and transmit to said line interface a second timing signal that is synchronized to said first timing signal;
• and
• said line interface is further operable to generate and transmit onto the subscriber loop a third timing signal that is synchronized to said second timing signal, said digitized voice data digitized in synchronization with said third timing signal.