Pabx/intercom system via an rj11 cable, providing gsm network connectivity instead of traditional landlines. it supports incoming/outgoing calls for all extensions and works with quad band gsm (850/900/1800/1900mhz) networks. these units enhance flexibility in areas with poor infrastructure.
gsm terminal: a device like a gsm850/1900/ 900/1800mhz quad band gateway with an antenna.
pabx/intercom: a pabx switch that accepts rj11 co (central office) lines.
sim card: active gsm sim card (airtel, mtn, etc.).
connection: connect the fwt's rj11 port to the pabx co/trunk port, not the extension ports.