I'm not aware of any plans of adding support for this. The problem is that for MGCP, the call agent (callmanager or whatever) is in control of the port. It's architecturally so different, I would doubt it will ever happen. T.37 relies on the logic in the router to answer the call and figure out it's a fax call so it can be handled.
How would the winfax box be attached to everything else? The thing that I would be concerned about is making sure that everything in between can transfer the fax fine. E.g. if the call is coming into a router controlled by MGCP, the outgoing gateway (another IOS router, vg248, ATA, etc) must also support and be configured for the same fax relay--such as T.38 or cisco fax relay (or passthrough). Since the winfax will be attached to an analog trunk (I would think), it's basically the same as having a fax machine attached to that port.
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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 ...