Caller ID of a new call doesn't appear on my 55i or 57i when I'm on another call

To make caller ID appear on your Aastra-style phone (i.e., ZIP55i, ZIP57i, etc), within the device profile in the MX Admin, add this line to the bottom, save, apply, and then reboot the phone.
switch focus to ringing line : 1
Problem fixed courtesy of Dynam Communications.
Call us for a quote for additional phones or licenses.  Never hurts to compare prices.
Dynam Communications

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