Digital sets must have a DN assigned to key 0 which is termed the "Prime DN". For M2008 and M2616 sets additional DNs maybe assigned to other keys. There are four different types of DN that can be assigned to keys on a digital set.
These are :-
· Single Call Ringing (SCR)
· Single Call Non-Ringing (SCN)
· Multiple Call Ringing (MCR)
· Multiple Call Non-Ringing (MCN)
Single Call DNs
The diagram above shows a M2008 set with two DNs assigned. Key 0 is the Prime DN which is a "Single Call Ringing" (SCR) DN and Key 3 has a secondary DN assigned to it which is a "Single Call Non-ringing" (SCN) DN. With Ringing DNs when the DN is called the lamp next to the key flashes and an audible ring sounds out of the loudspeaker. With Non-ringing DNs however only the lamp flashes. In both cases the DN can be used for one call at any time and hence they are said to be "Single Calling". Since each DN appears on one set only they are "Single Appearance".
Single Call / Multiple Appearance DNs
In the diagram above it can be seen that the Prime DN of set A (4001), also has an appearance on Set B. A DN can be assigned to a maximum of 30 sets. As soon as the DN is used by one set it cannot be used by any other set, therefore it is said to be "Single Calling" and since it appears on more than one set it is said to be "Multiple Appearance".
Multiple Calling DNs
The diagram above shows an example of a Multiple Calling DN. With Multiple Call DNs, whilst the DN is being used on one set, the same DN is free to be used on another set that has an appearance of that DN. A maximum of 30 sets can have an appearance of a Multiple Calling DN. With a maximum of 30 appearances this means that 30 different calls can be in progress at any time on that one DN. Multiple Calling DNs can be a good solution to small Call Centre applications
e.g. help desks where only one number is published.
Each set having an appearance of a Multiple Calling DN can be individually programmed to be ringing or non ringing.
Feature Implementation
On each set the Directory Number must be assigned to a key and the DN type (Single Calling or Multiple Calling) Ringing or Non Ringing must be specified.
Example
In this example a Multiple Call Ringing DN (2700) has been assigned to two digital sets. It has been placed on key 3 of one set and on key 11 of the other. Set a DNDR value of 10 seconds on the digital set with the non-ringing appearance.
LD 11
Load Program 11.
REQ CHG Change
TYPE 2616
TN 8 5
ECHG YES Use Easy Change
ITEM KEY 3 MCR 2700 Multiple Call Ringing DN2700 assigned to Key 3
MARP
CPND
KEY
ITEM
REQ CHG
TYPE 2616
TN 8 6
ECHG YES
ITEM KEY 11 MCN 2700 Multiple Call Non Ringing DN2700 assigned to Key11
MARP ON TN 008 0 00 05
MARP
CPND
KEY
ITEM DNDR 10 Directory Number Delayed Ring set for 10 secs
ITEM
REQ END Exit
Directory Number Delayed Ringing
This feature allows a Single Call Non-ringing (SCN) or Multiple Call Non-ringing (MCN) key on a telephone to receive an audible notification after a specified delay.
When an incoming call is presented to an SCN/MCN key, the associated lamp starts flashing. If Directory Number Delayed Ringing (DNDR) is defined for the set, the audible notification is given after 1 to 120 seconds. The DNDR value is defined in Overlay 11 and is disabled if zero is selected as the delay value.
The DNDR value can be different on multiple TNs with the same DN appearance, therefore the audible notification may begin at different times for a single call. If Call Forward No Answer occurs before the DNDR delay expires, the call will be forwarded before the tone is given.
Colin