Have a look here on page 331
this will describe the feature in great detail as there are many ways to conigure
Also have a look at coverage path settings and some cor settings , but the simplest answer is to get the users to look at which button is ringing assign three call app as the first three buttons on the users sets and get them to do the work correctly.
also have a look at this
Interactions for Temporary Bridged Appearance
This section provides information about how the Temporary Bridged Appearance feature
interacts with other features on the system. Use this information to ensure that you receive the
maximum benefits of Temporary Bridged Appearance in any feature configuration.
Call Coverage
Calls that are redirected to Call Coverage maintain a temporary bridged appearance on the
called telephone if a call appearance is available to handle the call. The called party can bridge
onto the call at any time. You can administer the system to allow a temporary bridged
appearance of the call to either remain at, or be removed from, the covering telephone after
the principal bridges onto the call. If two parties are bridged together on an active call with a
third party, all three parties hear the bridging tone.
Consult
Consult calls use the temporary bridged appearance that is maintained on the call. At the
conclusion of a consult call, the bridged appearance is no longer maintained. If the principal
chooses not to talk with the calling party, the principal cannot bridge onto the call later.
Conference and Transfer
If a call has, or had a temporary bridged appearance and the call is then conferenced or
transferred, and is redirected to coverage again, a temporary bridged appearance is not
maintained at the conferenced-to or the transferred-to extension.
Privacy - Manual Exclusion
When Privacy - Manual Exclusion is activated, other users are prevented from bridging onto
a call. A user who attempts to bridge onto a call when this feature is active is dropped.
APSS (SME)
ACSS (SME)
ACIS (UC)