/mcpSingle-Button Barge and Single-Button cBarge The Single-Button Barge and Single-Button cBarge features allow a user to press the shared-line button of the remotely active call, to be added to the call. All parties receive a barge beep tone (if configured). If barge fails, the original call remains active. Phones support Single-Button Barge and Single-Button cBarge in two conference modes: • Built-in conference bridge at the phone that is barged—This mode uses the Single-Button Barge feature. • Shared conference bridge—This mode uses the Single-Button cBarge feature. By pressing the shared-line button of the remote-in-use call, the user is added to the call with all parties, and all parties receive a barge beep tone (if configured). If barge fails, the original call remains active. If no conference bridge is available (built-in or shared), the barge request gets rejected, and a message is displayed at the Barge initiator device. Built-In Conference When the user presses the Barge softkey or a shared-line button, a Barge call is set up by using the built-in conference bridge, if available. A built-in conference bridge is advantageous because neither a media interruption nor display changes to the original call occur when the Barge is being set up. Shared Conference When the user presses the cBarge softkey, or a shared-line button, a barge call is set up by using the shared conference bridge, if available. The original call is split and then joined at the conference bridge, which causes a brief media interruption. The call information for all parties changes to “Barge”. The barged call becomes a conference call with the barge target device as the conference controller. It can add more parties to the conference or can drop any party. When any party releases the call, the remaining two parties experience a brief interruption and then get reconnected as a point-to-point call, which releases the shared conference resource. Built-In and Shared Conference Differences This table describes the differences between barge with built-in conference bridge and shared conference. Barge with Shared Conference Barge with Built-In Conference Feature No Yes The standard softkey template includes the Barge/cBarge softkey. Note If the single button Barge/cBarge feature is enabled, the softkey is not used. Yes No A media break occurs during barge setup. Yes Yes If configured, a user receives a barge setup tone. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 518 Presence and Privacy Features Built-In Conference