AT&T 2500 series User Manual
DISTRIBUTED COMMUNICATIONS SYSTEM (DCS)
6-17
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Transparent Voice Terminal Features
The following voice terminal features operate transparently at voice terminals attached to nodes within a
DCS cluster. (See table 6-4 for a list of transparent voice terminal features and the communications
systems from which you can expect transparency.)
DCS cluster. (See table 6-4 for a list of transparent voice terminal features and the communications
systems from which you can expect transparency.)
Table 6-4. Availability of Transparent Voice Terminal Features
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DIMENSION
SYSTEM 85
SYSTEM 75
DEFINITY
PBX
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FEATURE FP8
R1
R2
R1
G1
G2
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Iss
3
- V1 V2 V3 V4 V1 V2 V3
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Alpha
Display
Y
N Y Y Y Y N Y Y Y Y
Auto
Callback
Y
N Y Y Y Y N Y Y Y Y
Call
Coverage
Tone
Y
N Y Y Y Y N Y Y Y Y
Call Forward
All
Calls
Y
N Y Y Y Y N Y Y Y Y
Call Waiting
Originating
Y
N Y Y Y Y Y Y Y Y Y
Call Waiting
Terminating
Y
N Y Y Y Y N Y Y Y Y
Distinctive
Ringing
Y
N Y Y Y Y N Y Y Y Y
Leave Word
Calling
(No
AP)
N
N N Y Y Y N Y Y Y Y
Call
Transfer/Conference
Y
N Y Y Y Y Y Y Y Y Y
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Alerting—Distinctive Ringing
For this feature, the switch generates distinctive ringing cycles (1-, 2-, or 3-burst ringing), which identify
the type of call (internal, external, or priority) for the called party.
the type of call (internal, external, or priority) for the called party.
When DCS transparency is lost for any reason, terminal-to-terminal calls made between nodes produce 2-
burst ringing instead of the usual 1-burst ringing. Loss of transparency may occur when the signaling link
between the nodes or node and endpoint is down or when data transmission delay exceeds the trunk
signaling time.
burst ringing instead of the usual 1-burst ringing. Loss of transparency may occur when the signaling link
between the nodes or node and endpoint is down or when data transmission delay exceeds the trunk
signaling time.
Automatic Callback on Busy or No Answer
This feature allows DCS users who placed a call to a busy or unanswered internal voice terminal/station to
be called back automatically when the called terminal/station becomes available. When the calling and
called terminals are idle, the switch automatically notifies both parties and makes the connection.
be called back automatically when the called terminal/station becomes available. When the calling and
called terminals are idle, the switch automatically notifies both parties and makes the connection.
Exceptions are as follows: