Nortel Norstar/BCM Door Opening Controller (DOC)

* Provides Norstar/BCM door phone with ability to unlock electric doors simply by pressing an OPEN softkey display button or a dial pad digit on their Norstar/BCM set * DOC enables electronic devices (e.g. alarm systems, surveillance cameras, lights, etc.) to be controlled through a contact closure (third party supplied) * Each door phone can communicate with up to 12 DOCs