BusinessPhone Communication Platform 4.0
Facilities

## Route Selection

## Definition

### Simple route selection

Route selection means that an extension, by means of directory number automatically selects a free trunk for outgoing traffic.

All trunks that run to the same public exchange or other exchange are called “route”.

Each route must be assigned a directory number.

### Alternative route selection

Alternative route selection means that if there exist different paths to reach an addressee and if one path is blocked, the system can undertake reselection to another path.

## Use

By dialling the route call number directly, the user can obtain a free trunk to the desired public exchange or to another exchange.

The system will automatically select the first free trunk of the route according to the programming (sequential or random).

If there is no free trunk in the normal route the system will attempt to select a trunk in an alternative route, if programmed accordingly.

## Operation

### All telephones

#### Free trunk available

An outgoing external call can be initiated by dialling the route's directory number on the key set or rotary dial.

If a free trunk exists in the selected route, the caller will receive dial tone from the called system.

The display shows the dialled route number: e.g.: “0”

#### All trunks are busy

If there is no free trunk, the caller receives busy tone.

The display shows “BUSY” or “B”:

The caller can now select to terminate or to order callback to the route.

See Automatic Callback – Trunk/Route (116/155 34-ASB 150 02 Uen).

## Capacity

The maximum permissible number of routes is 255.

The maximum permissible number of trunks per route is limited to 46.

If the total number of trunks to one destination exceeds 46, it is recommended that the remaining trunks are programmed as incoming only.

The number of reselection possibilities for alternative route selection is two.

The maximum number of digits that can be added to the original number on reselection is 10.

## Limitations

The possibility, from a certain extension or trunk, to access a desired route is determined by the traffic group matrix.

Trunks that are not placed in a route can only be accessed by dialling the individual directory number of the trunk or by pressing a programmed external line key.

If so desired, a trunk can be included in several routes, for example in a private group network with fixed length numbering scheme where different first digits denote different exchanges but where all calls go to the same group of trunks.

## Programming

On initiation of the system all trunks belong to the same route. The call digit (directory number) of this route is “0”.

5401 |  | Create a route

3201 |  | Trunk route members

3301 |  | Random Selection

3302 |  | Callback allowed?

5501 |  | Delete a route

5608 |  | Alter route number

### Fixed lengh numbering scheme

3303 |  | Predigits

### Alternative routing

Two alternative routing possibilities can be programmed for each route. For each alternative routing possibility a number of digits can be stated that are transmitted before the keyed digits.

3304 |  | First alternative route

3305 |  | Predigits for first alternative route

3306 |  | Second alternative route

3307 |  | Predigits for second alternative route

## Equipment

None

Revision: D © Ericsson Enterprise 2003