Active Voice didn't have their own fax server, they OEMs Interstar's LightningFax for a while there which is probably what you're thinking of (this was called ActiveFax and shipped with versions up to Unity 2.4.6).
Here's the list of currently tested and supported 3rd party fax servers for all Unity products:
Captaris RightFax Version 6 or higher Esker FaxGate Version 7 or higher FAXCOM for Exchange Version 6.19 or higher Fenestrae FAXination Version 4 or higher Interstar LighteningFax Version 5.5 or higher Omtool Fax Sr. Version 3 or higher Optus FACSys Version 4.5 or higher
If you search around out here, though, you'll see information about how you can test with other fax servers (it's pretty easy) if the customer has a product that isn't on this list.
In order to qualify for support*, the Fax Server must provide three key features: 1. There must be an Exchange Gateway or Connector component that facilitates communication between the Fax Server and Microsoft Exchange. 2. The fax messages must arrive in the subscriber's Inbox with a distinct message class such as IPM.Note.Fax. 3. Clients must be able to send outbound fax messages using this addressing format: [FAX:name@number].
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...