To clarify - debug isdn q931 does definately work on MGCP.
I've only seen it not work once, that was an IOS 15 release that decided to show me hex instead of the decoded output. I strongly suspect that the folks not seeing output (assuming you can see debug output from other commands, and therefore don't have a simple ssh/telnet session problem, and that you have followed Gordon's advice (+5) and checked someone hasn't filtered the debug with conditions) are hitting some sort of bug. That was my issue, and an update fixed it after a lot of 'is this a new IOS 15.0 feature?' head scratching :-)
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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
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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 ...