Toshiba RSTU3A Standard Phone Interface Unit with Message Waiting (Refurbished)Key Features: Mfr. Part #: RSTU3A Provides 8 standard telephone station ports 1 port per DTMF or rotary telephone, or peripheral device such as Voice Mail, Auto Attendant, fax, etc. 1 port per off premises station, type OL13B line Maximum 2 per DK40 system Inserts into expansion cabinet Condition: Refurbished