NEC Xen Master Programming Manual page 78

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1. If 00 (Not Set) is programmed, no trunks are accessed for this priority setting.
2. If Route Advance Block Numbers are assigned and a line key is pressed or an Access Code is dialled, the system
starts searching for an idle line in a specified group (beginning with the Trunk Group assigned priority 1).
3. If all CO/PBX lines are in use, the line with the next highest priority is seized.
4. Route Advance Block Number Access Codes are defined in Memory Block 1-1-46 Access Code (1-Digit) Assignment
or Memory Block 1-1-47 Access Code (2-Digit) Assignment.
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Xen Master & Xen Axis
Route Advance Block Assignment