The phone uses the CSS of the device setting I believe, and the line partition and CSS are defined on the line, so if the CSS on the phone device itself was not able to call, I think what you describe might happen.
Have you tried Call Viewer on Unity to see what the call appears to be doing there ?
It sounds like the call makes it to Unity ok, but then is disconnected after that.
If I understand correctly, incoming calls from the PSTN at a remote location are disconnected after they hit Unity, according to Call Viewer. My guess is that the MGCP GW or CallManager is disconnecting the call.
I would start by looking at CallManager traces for the MGCP messages to see which device is disconnecting. You should also be able to get an indication why the call is disconnecting, if CallManager is initiating the disconnect. "debug isdn q931" from the GW would be useful as well.
Let us know if we can help with looking at any of this info.
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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 ...