BusinessPhone Communication Platform 5.1
Facilities

## Incoming External Calls

## Definition

Incoming external traffic denotes traffic from the public exchange or other exchange to an extension via a trunk.

## Use

Each incoming trunk can be assigned an optional answering position.

This enables the system to be programmed so that incoming traffic is handled in the optimum manner.

It is essential to consider how incoming traffic is to be handled so that the system can be programmed to function at its most effective.

The various answer alternatives are described below. It is possible to select one or an optional combination of answer alternatives.

### OPERATOR traffic

If the incoming trunks are to be answered (served) by one or more OPERATORs, the trunks are to be assigned the answering position that corresponds to the directory number of the OPERATOR queue.

Incoming external calls will then be directed to this directory number.

If there is no free OPERATOR, the call will be placed in the OPERATOR queue.

For OPERATOR traffic it is advisable to also program the alternative answering position for the trunk with the directory number of the OPERATOR queue so that unanswered calls are directed back to the OPERATOR who extended the call.

See also Operator (380/155 34-ASB 150 02 Uen).

### Private trunk line

Each individual trunk can be assigned an individual answering position.

An incoming call will then call the programmed directory number.

This can be utilised if, for example, a certain trunk is a private line, that is by dialling a certain public network directory number the call can go directly to the identified extension. If busy tone is received, the call can be either camped on or directed to an alternative answering position.

### Common call pick-up function

Each individual trunk that is to call the group is programmed with a fictive directory number as answering position.

In the event of several simultaneous calls these will be camped on to the answering position.

Those extensions that are members of the group program a key for supervision by which calls to the answering position can be picked up.

See also under Call Pick-up-Common (142/155 34-ASB 150 02 Uen).

### PBX- (extension)-group as answering position

In this case the trunk is programmed so that the directory number of the PBX-group is inserted as normal answering position.

It is advisable to program the alternative answering position for the same PBX-group so that "abandoned" calls are directed back to the group.

See also under Group (PBX)-hunting (220/155 34-ASB 150 02 Uen).

### Key-system

Using a key-system it is possible to answer calls to a certain trunk from any extension.

On each system telephone on which the trunk is represented the associated lamp will flash when an incoming call exists.

On each telephone that is to be a member of the group it is necessary to program an external line key for each trunk that is to be answered.

In this case the trunk is not assigned an answering position.

See also under Key-system Function (300/155 34-ASB 150 02 Uen).

### ACD-group as answering position

If the trunk is to be included in an ACD- (Automatic Call Distribution)-route, the directory number of the ACD-group is to be programmed as answering position.

See also ACD-groups (105/155 34-ASB 150 02 Uen).

### Direct InDialling (DID)

For direct indialling trunks the customary answering position shall not normally be programmed.

The directory number that is to handle redirected calls in the event of no reply, e.g. the OPERATOR queue is stated as alternative answering position.

See also Direct Indialling (DID) (162/155 34-ASB 150 02 Uen).

## Operation

See under relevant facility description.

## Capacity

The number of incoming trunks is limited by the number of voice (speech) channels (60).

## Limitations

Incoming calls on trunks are always presented on programmed external line keys even if an individual answering position has been programmed.

New incoming calls are directed to an individual answering position if one has been programmed. If no individual answering position exists, the trunk call is directed to the alternative answering position.

### Special limitations for an ISDN trunk

Most of the features described under the item USE are related to anlagoue trunks or digital CAS lines without DID.

This will also work in conjunction with an ISDN-trunkline without subscribtion of the supplementary service DID.

In case of outgoing traffic it is possible in ASB 150 02 to create groups of B-channels for defined purposes (e.g. tenant groups or ACD groups) but it depends on the national network operator if this is also supported.

In case of incoming traffic it is not possible to assign B-channels to specific groups.

## Programming

1101 |  | Answering position at day

1102 |  | Answering position at night

1103 |  | Reroute position at day

1104 |  | Reroute position at night

1109 |  | Common voice announcement interruptable

## Equipment

None

Revision: B © Ericsson Enterprise 2003