The Multiple Contacts feature permits multiple SIP devices to register with the same DN. This ability is especially useful for mobility subscribers because it eliminates the need for separate DNs to be established for office and offsite devices.
A subscriber may originate a call from a device (using the DN) independent of the use of the other devices registered as multiple contacts for the same DN.
When a subscriber receives an incoming call, the following takes place depending on whether the multiple contact devices are idle:
If all multiple contact devices are idle:
Each device is alerted. When one of these devices answers the call, the alerting to the other devices stops.
If one or more device is in use:
Lotus Sametime Unified Telephony presents the second call to the device in use as a call waiting (camp-on) call.
The other idle devices are simultaneously alerted.
It is highly recommended that all multiple contact devices be under the control of one subscriber, rather than being shared by multiple subscribers. If multiple subscribers are involved, incoming calls may not be answered by the correct subscriber because incoming calls are distributed to all multiple contact devices.
This feature also ensures that notifications, like message waiting notifications, are transmitted to all registered contacts for the subscriber.
Parent topic: Calling Services