Matrix Visionpro System Manual page 115

However, when the user dials '0' again, PBX-B applies Toll Control. It detects the dialed number as '00' and
interprets this as an attempt to dial a long distance number. Since station 21 is not allowed long distance dialing in
its Toll Control, PBX-B rejects dialing on the trunk and plays an error tone to station 21.
VISIONPRO solves this problem by providing programmable PBX Expansion Count (PEC) for each trunk. This
count is the number of digits to be ignored before toll control check begins. The PBX Expansion Count is same as
the number of PBXs connected between the main PBX and the last subscriber.
On trunks that are connected to another PBX, in this case, T4, T5, and T6, PBX Expansion Count must be
configured with the same number of digits as the Trunk Access Codes assigned for PBX-B. For example, if the
Trunk Access Code is a single digit number like '0', the PBX Expansion Count must be configured as '1'. If the
Trunk Access Code is a two-digit number like '61', the PBX Expansion Count should be configured as '2'.
On trunks directly connected to the CO network, as for T1, T2, T3 of VISIONPRO, the PBX Expansion Count must
be configured as '0'.
To take the above example further, assume PBX Expansion Count is configured as '1' on T4, T5 and T6. When the
user of station 21 dials '0' followed by another '0' to grab T1 or T2 trunk of PBX-A, the system will check the PEC
configured on the trunk. On finding the count as '1', the system will ignore the first '0' dialed by the station, and let
the station user grab T1 or T2 by considering the second '0'. The station user will get the CO dial tone from T1 or T2
of PBX-A.
• The PBX Expansion Count should be configured only for 'Behind the PBX Applications'. For all normal
applications, this count must be set to '0' for all the trunks. Otherwise, external number dialing may be
hampered. Features like Least Cost Routing will also be affected.
• VISIONPRO supports PBX Expansion Count for each trunk.
How to configure
For CO Trunks that are directly connected to the CO, PBX Expansion Count must be configured as '0'.
For CO Trunks that are connected to the stations of another PBX, PBX Expansion Count must be configured as per
the number of digits in the Trunk Access Codes defined for trunks in the other PBX. If the TAC of the other PBX is
of single digit, configure PBX Expansion Count as '1'. If TAC is of double or triple digits, select '2' or '3' respectively
as the PBX Expansion Count.
To configure the PBX Expansion Count on a CO Trunk port,
• Enter SE mode.
• Dial 3201-1-Trunk-PEC Count.
Where,
Trunk is the software port number from 0 to 2.
PEC Count is the PBX Expansion Count from 0 to 9.
By default, PEC for all trunks is 0.
• To configure the same PBX Expansion Count for all trunks, dial,
3201-*-PEC Count
• Exit SE mode.
109 Matrix VISIONPRO System Manual