Twinning allows a user's calls to be presented to both their current extension and to another number. The system supports two modes of twinning:

User BLF indicators and application speed dials set to the primary user will indicate busy when they are connected to a twinned call including twinned calls answered at the mobile twinning destination.

Do Not Disturb and Twinning

Mobile Twinning

Selecting DND disables mobile twinning.

Internal Twinning

• Logging out or setting do not disturb at the primary stops twinned calls alerting at the secondary also.

• Logging out or setting do not disturb at the secondary only affects the secondary.

Do Not Disturb Exceptions List

For both types of twinning, when DND is selected, calls from numbers entered in the user's Do Not Disturb Exception List are presented to both the primary and secondary phones.

Internal Twinning

Internal twinning can be used to link two system extensions to act as a single extension. Typically this would be used to link a users desk phone with some form of wireless extension such as a DECT or WiFi handset.

Internal twinning is an exclusive arrangement, only one phone may be twinned with another. When twinned, one acts as the primary phone and the other as the secondary phone. With internal twinning in operation, calls to the user's primary phone are also presented to their twinned secondary phone. Other users cannot dial the secondary phone directly.

• If the primary or secondary phones have call appearance buttons, they are used for call alerting. If otherwise, call waiting tone is used, regardless of the users call waiting settings. In either case, the Maximum Number of Calls setting applies.

• Calls to and from the secondary phone are presented with the name and number settings of the primary.

• The twinning user can transfer calls between the primary and secondary phones.

• Logging out or setting do not disturb at the primary stops twinned calls alerting at the secondary also.

• Logging out or setting do not disturb at the secondary only affects the secondary.

• User buttons set to monitor the status of the primary also reflect the status of the secondary.

• Depending on the secondary phone type, calls alerting at the secondary but then answered at the primary may still be logged in the secondary's call log. This occurs if the call log is a function of the phone rather than the system.

• Call alerting at the secondary phone ignoring any Ring Delay settings applied to the appearance button being used at the primary phone. The only exception is buttons set to No Ring, in which case calls are not twinned.

The following applies to internal twinned extensions:

If using a 1400, 1600, 9400, 9500, or 9600 Series phone as the secondary extension:

• The secondary extension's directory/contacts functions access the primary user's Centralized Personal Directory records in addition to the Centralized System Directory.

• The secondary extension's call Log/call List functions access the primary user's Centralized Call Log.

• The secondary extension's redial function uses the primary users Centralized Call Log. Note that the list mode or single number mode setting is local to the phone.

It is also shown on 3700 Series phones on an Avaya Wireless DECT system installed using system provisioning .

For all phone types, changing the following settings from either the primary or secondary extension, will apply the setting to the primary user. This applies whether using a short code, programmable button or phone menu. The status of the function will be indicated on both extensions if supported by the extension type.

• Forwarding settings.

• Group membership status and group service status.

• Voicemail on/off.

• Do Not Disturb on/off and DND Exceptions Add/Delete.

Mobile Twinning

This method of twinning can be used with external numbers. Calls routed to the secondary remain under control of the system and can be pulled back to the primary if required. If either leg of an alerting twinned call is answered, the other leg is ended.

Mobile twinning is only applied to normal calls. It is not applied to:

• Intercom, dial direct and page calls.

• Calls alerting on line appearance, bridged appearance and call coverage buttons.

• Returning held, returning parked, returning transferred and automatic callback calls.

• Follow me calls.

• Forwarded calls except if the user's Forwarded Calls Eligible for Mobile Twinning setting is enabled.

• Hunt group calls except if the user's Hunt Group Calls Eligible for Mobile Twinning setting is enabled.

• Additional calls when the primary extension is active on a call or the twinning destination has a connected twinned call.

A number of controls are available in addition to those on this tab.

Button Programming Actions

The Emulation | Twinning action can be used to control use of mobile twinning. Set on the primary extension, when that extension is idle the button can be used to set the twinning destination and to switch twinning usage on/off. When a twinned call has been answered at the twinned destination, the button can be used to retrieve the call at the primary extension.

Mobile Twinning Handover

When on a call on the primary extension, pressing the Twinning button will make an unassisted transfer to the twinning destination. This feature can be used even if the user's Mobile Twinning setting was not enabled.

• During the transfer process the button will wink.

• Pressing the twinning button again will halt the transfer attempt and reconnect the call at the primary extension.

• The transfer may return if it cannot connect to the twinning destination or is unanswered within the user's configured Transfer Return Time (if the user has no Transfer Return Time configured, a enforced time of 15 seconds is used).

Short Code Features

The following short code actions are available for use with mobile twinning.

• Set Mobile Twinning Number.

• Set Mobile Twinning On.

• Set Mobile Twinning Off.

• Mobile Twinned Call Pickup.