BusinessPhone Communication Platform 4.0
Facilities

## ISDN Caller List

## Definition

The ISDN caller list enables an authorised user of a system telephone to store in his/her own caller list incoming DDI ISDN calls, which could not be answered because of absence or busy.

## Use

By storing unanswered calls in the system, e.g. in case of no answer or busy, this function will ensure that no incoming ISDN calls to system telephones will be missed.

Via the telephone the following activities can be performed when calls are stored in the caller list:

- Read-out of the number of unanswered calls
- Scrolling through the caller list
- Calling the stored numbers in the caller list
- Read-out of time and date of incoming calls
- Read-out of the number of attempts for an incoming call
- Erasing of calls from the caller list

## Operation

If calls are stored in the caller list, the user can scroll through the list in order to decide which number he/she wants to call back. The ISDN calling party numbers are stored chronologically according to their arrival.

If the list is full, each further unsuccessfull incoming call will delete the oldest call in the list (first in-first out-principle).

Callers which are calling several times are stored in the caller list as a single entry, with the latest arrival time and a counter showing the number of call attempts.

### Storage criteria

The criteria for the storage of an unsuccessful ISDN DDI call in a callers list are the following:

- The minimum ringing time at the extension must be more than 3 seconds.
- The calling party number must be provided by the public network.
- The extension must be the first call destination in the system. (Already answered and transferred calls are not stored in the caller list)
- If the desired extension has activated a call diversion (follow me, direct, busy or no reply), the incoming ISDN call is only stored at the diverting extension if the diversion address does not answer the call. The minimum ringing time at the diversion address must also be more than 3 seconds.
- If the desired extension does not answer within the trunk reroute timeout, the incoming ISDN call is stored in the caller list independent of whether or not the call will be answered by the reroute position of the trunk.
- If the desired extension is busy, the incoming ISDN call is stored in the caller list independent of whether or not the call will be answered by the reroute position of the trunk.

### Storage principle

In case of an incoming ISDN call using numbering plan E164, the following call number types can be received for the calling party in the call set-up message.

- Unknown
- National
- International
- Network specific
- Local directory

If the received calling party number is of type “national” or “international”, the calling party number has to be complemented with the respective prefixes stated in commands 1936 and 1937 and stored in the caller list.

Calls covering other call number types than “national” or “international” are stored as they are received.

### Executive Telephone

The number of calls in the list are indicated on the display, e.g. “10 CALLS” indicates that 10 calls are stored in the list.

#### To display the first entry in the caller list

- Press list.

The display shows the first entry in the ISDN caller list:

call: calling the stored number

next: scrolling through the list

time: read out date and time of arrival and number of call attempts

erase: delete stored number

#### Calling the stored number

- Press call to call the selected number.

If no default route number is programmed, the user has to enter the number manually. For more information, see Error messages.

#### Scrolling through the list

- Press next to scroll through the list.

#### Read out time of arrival and number of call attempts

- Press time to read out date, time and number of call attempts of the selected call.

#### Delete stored number

- Press erase to erase the selected call.

The next entry in chronological order is shown:

### Standard Telephone

The number of calls in the list is indicated on your display, e.g. “C10” indicates that 10 calls are stored in the list.

#### To display the first entry in the caller list

- Press

The display shows the first entry in the ISDN caller list:

“L1” |  | calling the stored number

“+” |  | scrolling through the list

“0” |  | read out time of arrival and number of call attempts

“-” |  | delete stored number

#### Calling the stored numbers

- Press to call the selected number.

If no default route number is programmed, the user has to enter the number manually. For more information, see Error messages.

#### Scrolling through the list

- Press to scroll through the list.

#### Read out time of arrival and number of call attempts

- Press to read out date, time and number of call attempts of the selected call.

#### Delete stored number

- Press to erase the selected call.

The next entry in chronological order is shown:

### Error messages

#### No default route directory number of the currently used extension

The user has to enter the route directory number manually. The number consists of up to 4 digits and is completed by pressing the #-key or the ENTER-key.

This kind of programming can be used for configurations where the user wants to use different routes, e.g. for business and private calls.

If an invalid route directory number is entered, the error message "INVALID ROUTE NUMBER" will be shown.

#### Common error messages

- "NO ENTRIES": The last entry in the list was erased or *48# was dialled although the list is empty.
- "FUNCTION BUSY - TRY LATER": Tandem configuration - This message is shown on the display to inform that the other member of the tandem configuration is retrieving the ISDN caller list.
- "OUT OF RESOURCES": More than 192 extensions are programmed with an ISDN caller list.
- "ERROR": A system error has been detected (e.g. timer cannot be triggered).
- "TIMEOUT": Timeout occurs (Default data: 30 sec.)

## Capacity

Up to 192 authorised DBC753, DBC662, DBC213 and DBC212 extensions can store unsuccessful ISDN DDI calls from the public ISDN network.

Per extension a maximum of 10 entries can be stored in the caller list.

## Limitations

- The following telephone types cannot have an ISDN caller list:

- OPERATOR’s Console
- ACD Agent
- ACD Supervisor
- Analogue telephone
- Digital telephone types without display

- Tandem configuration:

- For an ISDN caller list to be assigned, at least one extension – master or slave – must be an EXECUTIVE/STANDARD phone, irrespective of whether or not the slave is logged on.

- No caller list entries for Group (PBX)-Hunting calls with parallel distribution.
- In the following traffic cases, the number of callers in the caller list is not shown in IDLE state:

- Follow me.
- Direct diversion.
- Diversion on busy.
- Extension is an ACD agent.

- Concerning “Diversion direct”, “Diversion on no reply”, “Diversion on busy” and “Follow me”, the ISDN calling party number is stored for the first called party.

- If the programmed diversion or follow-me extension answers the ISDN call, no storage of the ISDN calling party number takes place.

- The maximum number of call attempts which can be shown on the display is 99. Even if there are more than 99 call attempts for one number, only “99” will be shown.
- Disconnecting an authorised DBC753, DBC662, DBC213 and DBC212 extension, stored ISDN calls will be deleted.

## Programming

0178 |  | ISDN caller list allowed

6803 |  | Tenant Route

1936 |  | International prefix to be included

1937 |  | National prefix to be included

## Equipment

STANDARD or EXECUTIVE Telephone.

A FECU at least for BP 250/50 Version 3 must be connected to the CPU-D4. For detailed description see Facility Description General (155 34-ASB 150 02 Uen).

Revision: H © Ericsson Enterprise 2003