Barge allows a user to get added to a remotely active call that is on a shared line. Remotely active calls for a line comprise active (connected) calls that are made to or from another device that shares a directory number with the line. Barge supports this type of remote-in-use call.
Phones support Barge in two conference modes:
?Built-in conference bridge at the target device (the phone that is being barged). This mode uses the Barge softkey.
?Shared conference bridge. This mode uses the cBarge softkey.
The original call requires G.711 codec. If G.711 is not available, use cBarge instead.
Info here:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803f3a86.html#wp1054483
