640 Matrix ETERNITY NE System Manual
The PPDC defines the number of digits to be dialed by the extensions to reach the PSTN. The system applies Toll
Control check on extensions only after checking the configured PPDC.
On trunks that are connected to another System, in this case, T5, T6, and T7. PPDC must be configured with the
same number of digits as the Trunk Access Codes assigned for System-A. For example, if the Trunk Access Code
is a single digit number '0', the PPDC on must be configured as '1'. If the Trunk Access Code is a two-digit number,
61, the PPDC should be configured as '2'.
On trunks directly connected to the PSTN, i.e. T1, T2, T3, T4 of SARVAM UCS, the PPDC must be configured as
‘0’.
To take the above example further, when PPDC is configured as ‘1’ on T5, T6 and T7, when the user of Extension
21 dials ‘0’ followed by another ‘0’ to grab T1 or T2 trunk of System-A, the system will check the PPDC configured
on the trunk. On finding ‘1’ the system will ignore the first 0 dialed by the extension, and let the extension user grab
T1 or T2 by considering the second ‘0’. The Extension user will get the PSTN dial tone from T1 or T2 of System-A.
How to configure
The PPDC 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 and Station Message Detail Recording will also be affected.
For CO Trunks that are directly connected to the PSTN, PPDC must be configured as ‘0’.
For CO Trunks that are connected to the extensions of another System, PPDC must be configured as per the
number of digits in the Trunk Access Codes defined for the second System.
To configure PPDC on a CO Trunk,
• Login as System Engineer.
• Under Basic Settings, click CO Trunks.
• Click the desired CO trunk number tab.
The parameters of the selected CO trunk tab appears.
• Click Hardware Settings to expand.
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