ISDN Features
Features Guide 365
Multiple Directory Number (MDN) Ringing Service
Description
Provides automatic direction of an incoming call from ISDN to a specific extension.
To realize this service, the MDN number informed from ISDN telephone company is required.
The MDN number is converted to a DN or FDN of the destination by using a pre-programmed
conversion table.
Assignable destinations are:
1. Regular extension with DN
2. Virtual extension with FDN
– Extension Group
– Incoming Group
– External Pager (TAFAS)
– Modem (Remote Administration)
– OGM Group (DISA message)
– Phantom Extension
Call Flow
Digits Modification Procedures
The System modifies the MDN number according to the following three parameters.
1. Digit to receive DID
The number of digits effective in the received MDN number.
2. Digits to delete
The number of digits to be deleted from the beginning of the digits processed in Step 1.
Receives the MDN number from ISDN.
Modifies the MDN number according to "DID Digit Modification."
Determines the destination DN or FDN according to "DID Dial Registration."
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