3Com VCX 3105, Telephone Manual

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NTERFACE
Call Transfer, Call Conferencing, and Bridged Line Calls
Bridged calls can be transferred by either the primary phone or the
secondary phone. The primary phone user and secondary phone user can
also set up a conference with a bridged call.
If the primary phone is on a bridged call and presses the Transfer button,
the primary phone user hears a dial tone. The user can then enter a
telephone number to start attended or unattended call transfer. While
the primary phone user enters the phone number, the calling party is put
on hold. However, the light for BSA line on the secondary phone remains
on (does not blink as it would for a non-bridged call on hold).
While on a bridged call, the primary phone user can also press a free SA
line to transfer the call from a BSA line to a SA line. Or, a call connected
on a SA line can be transferred from the SA line to its BSA line. A
secondary phone user, however, can only transfer a call from an SA line to
BSA line but cannot transfer a bridged call to an SA line.
Both primary and secondary phones can set up a 3-way conference call
on a bridged line.
Call Park and Bridged Line Calls
Either the primary phone user or the secondary phone user can park a
call.
When either a primary or secondary phone user parks a call and the call
park timeout value is reached (the default is 5 minutes), the parked call
rings back only on the phone that parked the call. For example, if a
primary phone user parks a bridged call to a Call Park extension and no
one picks up the parked call, after 5 minutes the parked call rings back
only on the primary phone that parked the call. The call does not ring
back on a secondary phone or on any other primary login instance. When
the primary phone answers the call, the SA status light on primary phone
lights but the BSA status lights on the bridged phones do not light.
A parked call that rings back on a primary phone rings on the first free SA
line.
A parked call that rings back on a secondary phone rings on the first free
SA line.