Matrix Vision System Manual page 46

Matrix
How to program?
Use following command to program PBX Expansion count for a trunk:
3201-1-Trunk-PEC Count
Where,
Trunk is the software port number from 0 to 2.
PEC Count = PBX Expansion Count from 0 to 9.
By default, PEC for all trunks is 0.
Example:
Program PBX Expansion Count = 1 for trunk port 2.
3201-1-2-1
Use following command to program same PBX expansion count for all trunks:
3201-*-PEC Count
=X=X=
46 Vision System Manual