I may not be entirely current, but:
NEC AD-16 in-skin,
NEC AD-40 separate PC (digital or analog integration options available),
NEC AD-64 separate PC with IP integration to MS Exchange,
Activoice Repartee (analog version of AD-40),
All of these are very similar in configuration and user-interface. Active-voice is wholly-owned by NEC, so integration with NEC is a slam-dunk.
Non-NEC:
Baypoint Innovations* NuPoint Messenger Models 70, 120, or 640 (the 640 would be serious overkill). All were tested to integrate with NEC 2400IMS, and will thus also integrate nicely with the IVS/IVS2/IPS line.
This line is QNX or Linux-based (depending on the vintage)and are extremely stable, with nearly 100% uptime. Mitel revived this line because of its strong customer base and customer demand.
a point of contact would be
[email protected].
On the other hand, I would strongly avoid Baypoint's One-Point Messenger, which IMHO nearly killed Baypoint Innovations entirely due to a fatal memory leak. This product was discontinued at release 2.0 in mid-2001.
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*Baypoint Innovations was formerly known as Centrigram CPE and is now wholly owned by Mitel. A NuPoint may be branded as "MitelMail," which should not be confused with the Mitel Express Messenger line.