If a business requires recorded telephone transactions, customers can plug the 201A Recorder Interface Module- into the 20A Module Adapter, to provide an RCA jack that connects the Avaya 2420 telephone to an external recording device. Note: When any of the expansion modules are connected, you must connect an auxiliary power supply to the telephone. An1151B1 local power supply (material code: 175706) or an 1151B2 local power supply (material code: 177087) with Battery Holdover is recommended.
