The Alpha Communications® PM900 Control Unit with Cabinet is designed to provide 'no phone line capability' when interfaced with the Alpha Communications® TE903NP, TE904NP or DPH100W (concierge/guard) master/phone stations.
Can be used with either rotary or touch-tone service
No monthly phone line rental fee
Provides intercom (from lobby) for tenants that do not have outside telephone line service
Distinctive double ring differentiates between visitor calls and incoming calls