Telematrix LP550 - Manual (Page 10)

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.