AT&T MERLIN LEGEND System Reference Manual page 436

System Applications
VMI Capabilities
Transfer Redirect
Far-End Disconnect
3-4
Voice Messaging Systems
Table 3-2 Continued
VMI ports use swtchhook flashes in the same way single-line telephones do for
Hold. Transfer, Conference, and Drop. VMI ports also have the following
capabilities:
transfer redirect
far-end disconnect
VMI ports in/out of service
If unanswered by the end of the transfer redirect time interval (programmable for
0 to 9 rings), a call transferred from a VMl port will alert at the VMS transfer
redirect extension, rather than return to the VMI port that originated the transfer.
In the case of a blind transfer, when the transfer destination is busy or is an
invalid extension, the transfer redirect is immediate (no time interval). If the
transfer redirect station cannot be alerted (all buttons are being used), the VMS
will keep trying to alert the transfer redirect station every 20 seconds until the
alert is delivered or the caller hangs up.
For example, station port 15 is programmed as a VMl port and is connected to a
MERLIN Attendant. A call comes in on port 15, and the caller dials in a request
for extension 2224 (station port 24) at the recorded prompt. The call rings at
station 24 for four rings (the programmed transfer redirect time interval) and is
then redirected to station port 10, the system operator. The call is not redirected
back to port 15.
When a far-end disconnect signal is detected on an outside line/trunk on which
a call is made or received from a VMI port, the system sends the far-end
disconnect signal to the VMI port, whether or not the VMI port is the only party
left on the call. The VMS decides whether or not to continue the call (if another
party is still on the call). This far-end disconnect occurs only if the loop-start VMI
port is programmed for "reliable" disconnect.