Panasonic GD87 - Manual (Page 65)

Call Transfer
With two calls connected, Call Transfer lets you connect them
together, ending your connection and leaving the two callers to
talk together.
When two calls are in use:
The two calls will be connected to each other and your call will
be ended.
Note: Two call transfer cannot be utilised while in Multi-party
mode.
Multi-party Calls
A Multi-party call enables three to five people to be in
conversation at the same time. It is possible to swap between a
Multi-party call and another call in the same way as with two
separate calls.
Enabling Multi-party
With two calls connected (one active, one on hold):
A Multi-party call has been enabled, all three people will be able
to talk to each other.
Adding to Multi-party
It is possible to add to the Multi-party call (up to a maximum of
five) either by making a call or accepting an incoming call. The
call can then be merged into the Multi-party.
Note: When making a call or accepting an incoming call the
Multi-party call will be placed on hold. The callers in the
Multi-party call can continue to communicate with each other
while on hold.
Advanced Operation
67
Advanced
Operation
Select
Trans.
Select
Merge