Telematrix LP550 - Manual (Page 7)

The LP550 telephone can only operate behind a PBX. They cannot be connected directly to the PSTN.
Direct connection to the PSTN is illegal and unauthorized. Please call if there are any questions.
The LP550 telephone can only operate
behind a PBX. They cannot be connected
directly to the PSTN. Direct connection to the
PSTN is illegal and unauthorized. Please call
if there are any questions.