BusinessPhone Communication Platform 7.0
Facilities

## Tandem Configuration

## Definition

This document describes the interaction between two telephones (wired-cordless or wired-wired) working together as a unit.

## Use

Users with a “master telephone” (e.g. a wired phone on the desk) and a “slave telephone” (e.g. portable phone) in a TANDEM configuration are treated as one logical unit.

This feature enhances the communication for users that, for example, have a wired phone on their desks and need to be mobile within their company’s building having their own portable.

“The TANDEM operation makes the wired telephone mobile”

## Operation

### General

The TANDEM configuration is a unit, consisting of two telephones using the same directory number. One of the telephones is defined as the “master” and the other one as the “slave”.

### Numbering plan and categorisation

Each directory number is independent with it’s own parameters and COS (= Class Of Service).

If two directory numbers are working together as a unit, one has to be defined as a master and the other one as a slave.

Both telephones of the unit can be reached via the telephone number of the master (= the common directory number).

To keep up flexibility with different parameters and COSs, from the programming point of view, both master and slave are treated independent.

If the slave is assigned to a master, the slave is not reachable any more via it’s own directory number. (This directory number and the related administrative data is hidden in the internal directory.)

The common directory number is always shown:

- On the LCD of the slave
- On the CIL records in case of active calls from the slave
- On the display of the called party in case of a calling slave
- In the A-number

### Traffic conditions

When during logon at least one of the two phones is busy, the common directory number will be marked as busy.

The following table shows how a call to a busy common directory number will be announced, depending on the logging case:

Master | Slave | Logout | Logon
busy | free | busy tone/ringing on Line 2 | busy tone
free | busy | ringing on line1 | busy tone
busy | busy | busy tone/ringing on Line 2 | busy tone

In principle the TANDEM unit works as follows:

- for incoming calls, both telephones will be treated as one single extension
- for outgoing calls, both telephones will be treated as two seperate extensions

Note

Be sure always to create/change/delete the Slave directory number in the configuration part and in the cordless part of BMS (’Resolve Conflict’), especially when reconfiguring ASB 150 02.

### There are two kind of TANDEM configurations

- Slave permanently logged on
- Slave temporary logged on

#### Slave permantently logged on

Via system command it is possible to define that the slave is permanently logged on (see Programming”).

Incoming calls are always indicated on both telephones, the master ond the slave telephone.

#### Slave temporary logged on

The user of the TANDEM unit has the possibility to decide, whether incoming calls are presented only on the master (= slave logged off) or on both telephones (= slave logged on).

Via the Log on/off procedure the user can log on/off the slave.

### The Log on/Log off procedure

#### Procedure for logging on

##### *28# or a programmed “Slave log on/off”-key

If the slave is logged on, the LED of the “Slave log on/off” key shows steady light. The access for incoming calls to second line will be blocked automatically and the corresponding key “Busy Line 2”/“Free on 2nd access” depending on the programming shows steady light or extinguishes. The display shows:

    “SECOND USER LOGGED ON”

#### Procedure for logging off

##### #28# or a programmed “Slave log on/off” key

By this simple procedure the slave can be set to “Log off” mode. During that mode the slave is blocked for incoming calls. Incoming calls will be indicated (only) on the master telephone.

During this logged-off period it is still possible for the slave to set up a call.

If the slave is logged on, incoming calls will be indicated - depending on the programming - on both telephones or only on the slave:

#### Ringing indication on master and slave while logon-state

Both telephones will receive the same ringing cadence (= the ringing cadence of the master). If the call is answered by one of the terminals, the ringing stops at the other telephone.

The TANDEM unit will be marked busy for incoming calls (In the logged-on period blocking of line 2 is always activated).

#### Ringing indication only on slave

To make incoming calls to the slave visible also for the master, it is possible on system telephones with programmable keys to programm a special “slave supervision key”.

### Transferring a call between the members of a TANDEM unit

Depending on the type of telephone, the following procedure for transferring a call between the members of a TANDEM unit has to be executed.

1. Initiate inquiry (only necessary if there is no “supervise slave” key or “supervision” key of own common directory number available).
2. Dial own directory number or press the supervision key.
3. Transfer the call.

### Features

#### Abbreviated number dialling - common numbers

This feature is independent of the TANDEM unit. Master and slave can use the feature according to their individual categorisation.

For more information see Abbreviated Number Dialling – Common Numbers (101/155 34-ASB 150 02 Uen).

#### Abbreviated number dialling – individual numbers

This feature is independent of the TANDEM unit.

For more information see Abbreviated Number Dialling – Individual Numbers (102/155 34-ASB 150 02 Uen).

#### Account number

This feature is independent of the TANDEM unit.

For more information see Account Number (103/155 34-ASB 150 02 Uen).

#### ACD agent and supervisor

A TANDEM unit is not applicable for an ACD agent or supervisor.

For more information see ACD-Facilities (104/155 34-ASB 150 02 Uen).

#### Authorisation Code

Independent of the logged status and the orginator (master or slave) of this feature, the authorisation code is always related to the common directory number.

For more information see Authorisation Code (113/155 34-ASB 150 02 Uen).

#### Automatic callback

The alerting of the callback will always take place on the TANDEM unit, independent from the orginator (master or slave). If the slave is logged off and a callback will be initiated from the slave, the alerting of the call back will be presented on the slave again.

For more information see Automatic Callback – Busy/Free Extension (115/155 34-ASB 150 02 Uen).

#### Call information logging (CIL) function

Independent of the logged status the common directory number is always used for the caller’s number field in the CIL record.

For more information see Call Information Logging (CIL) Function (140/155 34-ASB 150 02 Uen).

#### Call metering

The collected data of the TANDEM unit is associated to the common directory number. The read-out function is possible according to the relevant class of service for master and slave.

For more information see Call Metering (141/155 34-ASB 150 02 Uen).

#### Call pick-up – Common

This feature is independent from the logged status. It only depends on the number of the free programmable keys of the slave.

For more information see Call Pick-up – Common (142/155 34-ASB 150 02 Uen).

#### Call pick-up – individual

This feature is independent from the logged status.

For more information see Call Pick-up – Individual (144/155 34-ASB 150 02 Uen).

#### Call waiting indication

If one member of the TANDEM unit is engaged in a call, the common directory number shall be marked busy. If someone initiates camp on, the call waiting indication will be presented on following members of the unit:

Master | Slave | Call waiting indication
busy | free | to Master
free | busy | to Slave
busy | busy | to Slave

For more information see Call Waiting Indication (145/155 34-ASB 150 02 Uen).

#### Camp on

Independent of the logged status it is possible for the master and slave to initiate camp on to a busy extension as far this extension allows camp on.

For more information see Camp On – Internal Calls (148/155 34-ASB 150 02 Uen).

#### Common bell

This feature is independent from the TANDEM unit.

For more information see Common Bell (151/155 34-ASB 150 02 Uen).

#### Conference

Independent from the logged status it is possible for the master or slave to build up a conference. If one member of the TANDEM unit initiates a conference, it is also possible to include the remaining member in this conference.

For more information see document Conference (154/155 34-ASB 150 02 Uen).

#### Intercom

An intercom key can only be supported on the master phone.

For more information see Intercom (266/155 34-ASB 150 02 Uen).

#### Diversion - direct

The activation of direct diversion from the slave always affects the common directory number, independent from the logged status.

If direct diversion is activated, both members of the TANDEM unit receive the special dial tone when they lift the handset.

For more information see Diversion Direct (165/155 34-ASB 150 02 Uen).

Note

In following configuration, command “0123 Repeated call diversion” has to be set to “Yes” for both extensions, the master and the slave:

#### Direct diversion if cordless instrument is not available

If a cordless phone is configured as a slave there exists the possibility to configure a direct diversion for the case that the cordless phone is switched off or out of coverage. In this specific cordless status the diversion order is defined in the following order:

1. Call will be indicated at the master until the 0119 Diversion time long timer ellapses.
2. Call will be diverted to the 0172 Fixed diversion destination for internal calls, if cordless/IP-Instrument is not available or to the 0173 Fixed diversion destination for external calls, if cordless/IP-Instrument is not available
3. If the previous step is not programmed the call will be diverted to the diversion on no reply destination

#### Diversion on no reply

Diversion on no reply always affects the common directory number.

For more information see Diversion On No Reply (167/155 34-ASB 150 02 Uen).

#### Diversion on no reply to slave

In addition to the feature “Diversion on no reply” there is the feature “Diversion on no reply to slave”.

After “Diversion time long” calls to the master will be rerouted to the logged off slave.

If the slave answers the call the slave is automatically logged on, if not the slave remains in the logged off state. If the slave is a cordless which is switched off or out of coverage the call will be diverted to the 0172 Fixed diversion destination for internal calls, if cordless/IP-Instrument is not available or to the 0173 Fixed diversion destination for external calls, if cordless/IP-Instrument is not available.

If the slave is not logged on, “Diversion on no reply to slave” has always a higher priority than “Diversion on no reply”.

#### Follow me

The activation of follow me from the slave always affects the common directory number, independent from the logged status.

If follow me is activated, both members of the TANDEM unit receive the special dial tone when they lift the handset.

For more information see Follow Me (202/155 34-ASB 150 02 Uen).

#### Group (PBX) hunting

Only the common directory number has to be included in a PBX hunting-group.

For more information see Group (PBX) Hunting (220/155 34-ASB 150 02 Uen).

#### Hotline

This function is independent of the TANDEM unit.

For more information see Hotline (240/155 34-ASB 150 02 Uen).

#### Hotel guest extension

The function “Hotel guest extension” is always related to the common directory number.

Note

In order not to confuse the guest with a display text like “2nd user logged on” we recommend to configure the TANDEM unit “Slave permanently logged on”!

#### Immediate answer

If the slave is logged on, an activated “Immediate answer” function is automatically deactivated.

For more information see Immediate Answer (260/155 34-ASB 150 02 Uen).

#### Information system

Independent from the logged status, an activated information system always affects the common directory number.

If the info system is activated the Message/Info key shows steady light and the display shows the activated information on both instruments.

For more information see Information (263/155 34-ASB 150 02 Uen).

#### Intrusion

If someone initiates intrusion, there will be a break in on following members of the TANDEM unit:

Master | Slave | Break in on
busy | free | Master
free | busy | Slave
busy | busy | Slave

For more information see Intrusion (266/155 34-ASB 150 02 Uen).

#### Key-system function

This feature is independent of the TANDEM unit and depends only on the programmed “external line keys”.

For more information see Key-system Function (300/155 34-ASB 150 02 Uen).

#### Last external number redial

This feature is independent of the TANDEM unit.

For more information see Last External Number Redial (320/155 34-ASB 150 02 Uen).

#### Loudspeaker paging

This feature is independent of the TANDEM unit.

For more information see Loudspeaker Paging (322/155 34-ASB 150 02 Uen).

#### Mailbox system

Independent from the logged status, messages can only be left in the mailbox of the common directory number. Both units, the master and the slave, are allowed to retrieve messages.

For more information see Mailbox System (340/155 34-ASB 150 02 Uen).

#### Parking for common access

This feature is independent of the TANDEM unit.

For more information see Parking For Common Access (401/155 34-ASB 150 02 Uen).

#### Private trunk line

If the external line key is programmed on the master or slave, it is possible to answer calls independent of the logged status.

For more information see Private Trunk Line (403/155 34-ASB 150 02 Uen).

#### Recall following parking

Independent of the logging status, a recall is always indicated on the orginator of the previous process.

For more information see Recall (440/155 34-ASB 150 02 Uen).

#### Reminder service

Independent of the logged status, an activated reminder service is always indicated on the orginator.

For more information see Reminder Service (442/155 34-ASB 150 02 Uen).

#### Saved external number redial

This feature is independent of the TANDEM unit.

For more information see Saved External Number Redial (460/155 34-ASB 150 02 Uen).

#### Secretary function

This feature is independent of the TANDEM unit.

For more information see Secretary Function (461/155 34-ASB 150 02 Uen).

#### Telephone directory

The telephone directory covers all master extensions. Slaves are excluded.

For more information see Telephone Directory (481/155 34-ASB 150 02 Uen).

#### Tenant function

Master and slave of a TANDEM unit belong to the same tenant group.

For more information see Tenant Function (482/155 34-ASB 150 02 Uen).

#### Traffic group matrix

Master and slave of a TANDEM unit belong to the same traffic group.

For more information see Traffic Group Matrix (484/155 34-ASB 150 02 Uen).

#### Wake-up facility

Independent from the logged status, an activated wake up call is always indicated on the orginator’s phone.

For more information see Hotel chapter “Wake-up facility” (241/155 34-ASB 150 02 Uen).

## Capacity

The total number of master and slave telephones depends on the max. capacity of the ASB 150 02 system and does not exceed 288 extensions, which means 144 TANDEM units (for more information see document 1555-ASB 150 02 Uen).

## Limitations

It is not possible to include the following telephones in a Master-Slave-configuration:

- DBC 224, DBC 214 and DBC 663
- ACD agent
- ACD supervisor

It is not possible to include two portables in a TANDEM‑configuration.

If the Master (system telephone) is plugged off, the call will be diverted according to the command 0112 Destination for fixed diversion.

If the Master (IP-telephone) is logged off, the call will further on be presented on the Slave.

## Programming

5630 Assign master/slave |  |

0101 Facility COS |  |

0123 Repeated call diversion? |  |

0165 Diversion on no reply to slave? |  |

0166 Slave always logged on? |  |

0167 Ring on master and slave? |  |

0172 Fixed diversion destination for internal calls, if cordless/IP-Instrument is not available |  |

0173 Fixed diversion destination for external calls, if cordless/IP-Instrument is not available |  |

0301 Key function |  |

3053 Program logon / out slave key |  |

3054 Program supervise slave key |  |

Note

When removing a portable, assigned as a slave, from a TANDEM configuration, be sure to delete the extension number of the portable telephone also in the DECT-system.

## Equipment

None

Revision: G © Ericsson Enterprise 2005