Setting Up And Using Isdn; Multiple Subscriber Numbering (Msn)/Direct Dialling In (Ddi) - BT Versatility V16 Owner's Manual

BT Versatility
Owners Manual

Setting up and using ISDN

If your BT Versatility is equipped with ISDN access, there are a number of additional
features available.

Multiple Subscriber Numbering (MSN)/Direct Dialling In (DDI)

Your ISDN Network Provider can allocate more than one number to each of your ISDN
Accesses. This ISDN supplementary service is called either Multiple Subscriber
Numbering (MSN) or Direct Dialling In (DDI). (MSN numbers are allocated to each
Point-to-Multipoint (P-MP) ISDN Access. DDI numbers are allocated across all your
Point-to-Point (P-P) ISDN Accesses).
These numbers may be programmed to ring individual extensions allowing callers to dial
through directly. You may also choose to allocate a number to a group of extensions, so
that a caller may dial through to that particular group.
A typical way of using this facility is to publicise one of these numbers as a fax number
and then route calls received on this number through to a fax machine connected to an
extension. Another typical use is to have users publicise their individual numbers and
have callers ring directly through to their extensions, but retain at least one number to
ring on a Line that can be provided with call services such as Auto-attendant, System
Voicemail box and Courtesy Service.
MSN/DDI numbers are also sent to the network as the Calling Line ID (CLI) for
presentation to the called party.
You may associate names with your MSN/DDI numbers and use the Tele-secretary
feature to have the name displayed for incoming calls.
You can programme your system to recognise up to one hundred MSN/DDI numbers.
Each is given an Index from 01 to 100.
If your ISDN Accesses are P-P then the 100 Indices can be shared across all ISDN
Accesses.
If your ISDN Accesses are P-MP mode, each Access can be allocated up to ten Indices.
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