Using this optional PGA-01 comms module (PSTN / POTS codec and digital hybrid), the Phoenix Mobile can connect to another Phoenix Mobile, Phoenix Studio, or other equipment. In the telephone hybrid mode, it can connect to virtually any telephone or telephone hybrid on the market. You can also use the built-in Frequency Extender as well as the Echo Cancellation functions with another Phoenix Studio, Phoenix Mobile, Course Hybrid, SWING, MPAC, TLE02, and TH02 equipment. RJ11 connector.
Shown installed in the Phoenix Mobile (sold separately).