Cisco Unified Communications Manager (CallManager)

A. Cisco CallManager decides that the IP phone is available again in one of these two ways:

• When IP phone B goes on-hook (in a scenario where it is busy).
• When IP phone B goes on-hook/off-hook (in a scenario where there is no answer).

A. If the IP phone is restarted, then the Call Back feature is still activated. If the IP phone is reset, the Call Back feature is still activated.

A. The Call Back feature is still activated. However, it can take some time (20 seconds) before Call Back Handlers are in sync. In this case, the assumption is that the IP phone fails over because, for instance, the Cisco CallManager service goes down. If, for instance, Computer Telephony Integration (CTI) or the Cisco Extended Functions (CEF) service also goes down, the Call Back feature is lost.

A. If the IP phone is restarted, the Call Back feature is still activated. If the IP phone is reset, the Call Back feature is still activated.

A. The Call Back feature is still activated. However, it can take some time (20 seconds) before Call Back Handlers are in sync. In this case, the assumption is that the IP phone fails over because, for instance, the Cisco CallManager service goes down. If, for instance, Computer Telephony Integration (CTI) or the Cisco Extended Functions (CEF) service goes down as well, the Call Back feature is lost.

A. Yes.

A. The Call Back feature is per phone.

A. No. When you already have one active Call Back and you want to activate it for another extension, you receive the message "Callback is active on <number 1>; Press OK to activate on <number 2>". When you hit OK, the Call Back for number one is lost.

A. The Call Back feature on the IP phone is lost. The reason for this is that Cisco does not broadcast the successful activation to backup the Cisco Extended Functions service (CEF).

A. The Call Back feature does not function if the speakerphone is disabled. Nothing happens when the Dial button is pressed. As a workround you can enable the speakerphone or press the Headset button to make use of the Call Back feature.

A. The Cisco Extended Function (CEF) service fails over to the next available Computer Telephony Integration (CTI) manager but all Call Back activation is lost.

A. A user presses the Callback softkey when a busy or ringback tone is received in order to receive call-back notification. You can activate call-back notification on a line on a Cisco IP phone within the same Cisco CallManager cluster as your telephone.

A. Cisco Call Back requires Cisco CallManager Release 3.3 or later and a Cisco IP phone that supports softkeys (Cisco IP Phone 7970, 7960 or 7940).

A. No. If a call is forwarded to voicemail then the Call Back feature does not work. The Call Back feature is designed to work when you hear a busy signal.