The Valcom PagePac Plus Controller works with PagePac "D" series Amplicenters for 70V multi-zone paging. Provides 8 individual zones plus group and all call page. Features: Attendant override for priority announcements Two, three or four-digit dialing codes Flexible zone numbering Interface with phone system page port, C.O. port or station port Up to 8 programmable zone groups 7 Different tones Expandable to 56 zones with zone expansion units (V-5335-100) Page port must provide contact closure and pass DTMF UL/CSA listed