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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Screen reference
997Trunk Group
17
NOTE:
Even if the trunk group supports full-duplex transmission, other equipment
in a circuit may not.
Disconnect Supervision-In
This field indicates whether the switch receives disconnect supervision for
incoming calls over this trunk group. It appears when the Direction field is
incoming or two-way. (If the Direction field is outgoing, the switch internally
sets this field to
n.)
The entry in this field is crucial if you allow trunk-to-trunk transfers. (To allow
trunk-to-trunk transfers involving trunks in this group, this field must be
y and the
Trunk-to-Trunk Transfer field on the Feature-Related System Parameters screen
must be
y). If a user connects 2 trunks through conference or transfer, and neither
far-end switch on the resulting connection provides disconnect supervision, the
trunks involved will not be released because DEFINITY ECS can’t detect the end
of the call. DEFINITY ECS will not allow trunk-to-trunk transfers unless it
believes that at least one party on the call can provide disconnect supervision.
Therefore, setting this field incorrectly may cause trunks to become unusable until
the problem is detected and the trunks are reset.
!
CAUTION:
In general, U.S. central offices provide disconnect supervision for incoming
calls but not for outgoing calls. Public networks in most other countries do
not provide disconnect supervision for incoming or outgoing calls. Check
with your network services provider.
Valid entries Usage
full
Enter full in most cases: this allows simultaneous two-way
transmission, which is most efficient.
half
Enter half to support only one transmission direction at a time.
Valid entries Usage
y
Enter y if (a) the far-end switch sends a release signal when the
calling party releases an incoming call, and (b) you want to
make the far-end switch responsible for releasing the trunk.
This entry allows trunk-to-trunk transfers involving trunks in
this group.
n
Enter n if the far-end switch doesn’t provide a release signal, if
your hardware can’t recognize a release signal, or if you prefer
to use timers for disconnect supervision on incoming calls.
Entering
n prevents trunk-to-trunk transfers involving trunks in
this group.