Editorial Reviews:
Product Description
RSTU - Provides 8 standard (analog) 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. PSTU - Provides 8 standard station ports. (Discontinued, replaced by RSTU)
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