User`s guide

1(2)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
98-01-26 A
162/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
SEA/TB/MP T.Preißner
SEA/TB/MP ASB 150 02
SEA/TB/X
DIRECT INDIALLING (DID)
Definition
DID denotes a function whereby a public network
subscriber, by number dialling, can connect her-/
himself to the wanted extension in ASB150 02.
Connection from the public exchange to ASB 150 02
can be analogue or digital.
Use
DID to extension
DID enables all public network subscribers, without
assistance from the OPERATOR, to access the
relevant extension.
This means for the company a saving in the number of
OPERATORs while at the same time it is easier for the
callers to learn whether the called extension is free or
busy.
Calls via OPERATOR
Subscribers who do not know the DID-number dial the
normal number (OPERATOR number) of the PBX and
are answered in the customary manner by the
OPERATOR who then extends the call.
Diversion on busy and no reply
If a called extension does not answer, is busy or, for
other reasons through-connection is not possible, it
can be determined by programming whether the caller
shall receive a tone message or whether the call shall
be diverted to the OPERATOR.
Types of DID
DID is no uniform function, but is dependent on the
signalling principle employed by the public exchange.
Contact the supplier in this respect.
Operation
Calls from the public network
In most DID cases the public network subscriber dials
the entire number including extension number in one
sequence.
For DTMF-direct indialling the subscriber also dials the
entire number, but in this case ASB 150 02 gives the
subscriber (caller) a new dial tone as an invitation to
dial an (optional) internal number.
In the event that the subscriber does not dial any digits
within a predetermined period, the call will be diverted
to the OPERATOR.
Calls to extensions
An incoming DID-call is signalled with the external ring
signal at the extension telephone and, on answer,
direct speech connection is established.
The called extension can initiate inquiry and transfer of
the call as for all other external calls.
Called extension does not answer
After a predetermined time the call will be diverted to
the OPERATOR or other selected answering position.
The extension is busy
The caller can receive busy tone directly or, if so
programmed, can be diverted to the OPERATOR or
another selected answering position.
Dialled number does not exist, is blocked or an in-
complete number has been received
The caller can receive busy or vacant tone directly. If
so programmed the caller can be diverted to the
OPERATOR or another selected answering position.
162.fm
Database reference