Nortel Norstar Door Phone (New)(Model # NTAB1223)
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It can be located up to 2600 feet away from the main system with optional SAP. It requires 1 unused station port, can ring one or multiple stations, can be used in conjunction with DOC for door strike operations, can be answered by voicemail, and up to 4 doorphones per system can be installed compatible with all releases.
Model # NT8B79 Nortel Door Opening Controller