AT&T MERLIN LEGEND System Reference Manual page 427

Features
Do Not Disturb
Forced Account Code
Entry
Forward and Follow Me
Group Calling
Headset Options
2-378 Transfer
Calls returning from a transfer are identified by call type and by the name and
extension number to which the call was transferred. The second line of the
display also shows the caller information.
When an MLX display telephone user receives a transferred call, the display
shows the type of call and the caller information on line 1. When an inside call is
being transferred, the display shows the extension number or line/trunk number.
When an outside call is being transferred, the line the call came in on is shown
or the caller's telephone number if ANl is available. The transfer originator is
shown on line 2.
When an MLX display telephone user does not complete a transfer (for example,
because Do Not Disturb is activated at the destination extension), the call
returns to the user's telephone and call information is displayed. The reason for
the incomplete transfer is not indicated.
Calls transferred to telephones that have Do Not Disturb activated are returned
after the Transfer Return Interval expires, unless the telephone has Coverage
and a receiver is available. In that case, the transferred call is redirected to the
receivers.
When a call is transferred, the destination extension cannot enter an account
code or overwrite the account code entered at the originating telephone.
Transferred inside and outside calls are forwarded. If a user transfers a call to
an extension with forward activated, the person receiving the forwarded calls
hears one ring, indicating an inside call. And, if the person has a display
telephone, he or she seas the call information for inside calls.
A call transferred to a calling group is not returned to the originator; the call is
handled just as any other call received in the calling group. For example, the
system follows the same hunt sequence to locate an available calling group
member and the call is eligible for a delay announcement if one is programmed.
A calling group member is considered available for a call while in the process of
transferring a call. Voice-announced transfers cannot be made to a calling
group. There is no limit to the number of calls that can be transferred to a calling
group.
When an inside caller is transferred to a calling group and no members are
available, the inside caller hears regular ringback. When an outside caller is
transferred to a calling group and no members are available, the outside caller
hears regular ringback or Music-on-Hold, if it is programmed.
When an MLX telephone user transfers a call, Headset Auto Answer is
deactivated and must be reactivated manually unless the user releases the call
by using the Headset Hang Up button.