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In this solution, I don't see how the call gets back to CallManager from the Call Transfer field in the second call handler. CallManager would need to have a route pattern that matched the dial string in the Unity call handler in order to route that...
I solved it this way: I use a translation pattern to change 911 to 801 which is forwarded to a Unity call handler via a line appearance on a 'dummy' 7960 with an expansion module. [A CTI Route Point would also work, but I have 19 offices so found it...