Dynamics Telephony can search other phone-number fields; custom fields or built-in fields. To have Dynamics Telephony search another phone-number field…

Add 1 diallerKVTable entry as follows

name: incomingLookup_x, where x is contact, lead, contact etc.
scope: global
key: N, – Where N is one more than the current largest Key value on others with name=incomingLookup_x
type: phone
value: y, – where y is the name of the field, e.g. new_fieldname
parent: leave blank

NOTE: The fields Dynamics Telephone searches out-of-the-box are
Lead; telephone1, telephone2, telephone3, mobilephone
Contact: telephone1, telephone2, telephone3, mobilephone
Account: telephone1, telephone2, telephone3