ATT DEFINITY Communications System Generic 3 Instructions Manual

DCS Call Coverage
Issue  3   March 1996
3-617
3. The call is redirected to the first coverage point, which is on the remote 
system. Also, at this time the DCS distinctive ringing message is sent to 
the coverage point along with two messages conveying the caller’s name 
and the principal’s name.
4. The coverage point rings with internal ringing if the caller is on a DCS 
node, or with external ringing otherwise.
5. The covering user answers and receives the calling party’s name and 
principal’s name on...

Feature Descriptions
3-618Issue  3   March 1996 
Operation Under Error Conditions. The following table describes the operation 
of DCS Call Coverage under error conditions
In a ddition, call consult operates as follows when the DCS link is down: If user A 
calls user B but the call covers to user C, then if user C consults b ack to user B, 
user B receives the consult call on the next call appearance.
User Interface
The user interface for DCS Call Coverage consists of station alerting and terminal...

DCS Call Coverage
Issue  3   March 1996
3-619
Displays. Displays at the coverage point work the same as for Call Coverage 
with the exceptions caused by DCS. In general, the disp lay at the coverage point 
takes the form
a=   
For call coverage, this format is always true because the system has all the 
information it needs from the calling party, principal, and coverage point. Under 
most circumstances, DCS also has all the information it needs, providing it in 
messages. In some DCS circumstances,...

Feature Descriptions
3-620Issue  3   March 1996 
B and B and C are DCS trunks transported over any kind of facility (ISDN or 
non-ISDN).
.
Figure 3-9. Display —  Non-DCS, Non-ISDN Trunk to DCS 
Trunk over Non-ISDN Trunk
In Figure 3-9, a call is made from the station on system A to the principal on 
system B and c overed b y the station on system C. The tie trunk b etween A and B 
is not a DCS trunk and is not an ISDN PR I trunk. The tie trunk  between B  and C is 
a non-ISDN PRI DCS trunk.
S75, G1,
or...

DCS Call Coverage
Issue  3   March 1996
3-621
.
Figure 3-10. Display —  Non-DCS, Non-ISDN Trunk to DCS 
Trunk over ISDN Trunk
In Figure 3-10, a call is made from the station on system A to the principal on 
system B and c overed b y the station on system C. The tie trunk b etween A and B 
is not a DCS trunk and is not an ISDN PR I trunk. The tie trunk  between B  and C is 
a DCS ISDN PRI trunk.
S75, G1,
G3, S85
or G 2G3V4
S ystem A S ystem BPrincipal
G3V4
Coverage Point
System C DCS link N on-ISD N...

Feature Descriptions
3-622Issue  3   March 1996 
.
Figure 3-11. Display —  Non-DCS ISDN Trunk to DCS ISDN 
Trunk
In Figure 3-11, a call is made from the station on system A to the principal on 
system B and c overed b y the station on system C. The tie trunk b etween A and B 
is not a DCS trunk but is an ISDN PRI trunk. The tie trunk between B and C is a 
DCS ISDN PRI trunk.
G1, G3,
S85 or G2G3V4
System A System BPrincipal
G3V4
Coverage Point
System C DCS link ISDN trunk
ISDN trunk
Calling Party
Coverage...

DCS Call Coverage
Issue  3   March 1996
3-623
.
Figure 3-12. Non-DCS ISDN Trunk to Non-ISDN DCS Trunk
In Figure 3-12, a call is made from the station on system A to the principal on 
system B and c overed b y the station on system C. The tie trunk b etween A and B 
is not a DCS trunk but is an ISDN PRI trunk. The tie trunk between B and C is a 
DCS trunk b ut not an ISDN PRI trunk.
If the calling p arty is a trunk on system A instead of a station, the displays are the 
same as above, substituting the...

Feature Descriptions
3-624Issue  3   March 1996 
.
Figure 3-13. Display — Call Initiated by a Trunk on System 85 
or G2
The display in this case depends on the administration on the G2. If the call is 
routed to trunk group AB via the internal dial plan (PROC 354 word 2), the G2 
sends a DCS name message for the calling trunk and the first display results. If 
the call is routed directly to a pattern without going through the internal dial plan, 
however, a name message is not sent, resulting in the...

DCS Call Coverage
Issue  3   March 1996
3-625
Hospitality Displays. If the hospitality feature is in use, the disp lay rules c an vary 
from those shown above depending on administration. The disp lays on terminals 
follow the same rules as above  except for one case  as  described in the following 
list.
nThe hospitality feature is enabled on the calling party’s system, the 
principals’ system, and on the coverage point’s system on page 2 of the 
“System Parameters Customer Options”  form.
nThe client...

Feature Descriptions
3-626Issue  3   March 1996 
nCoverage Call Ba ck
DCS Call Coverage does not support Coverage Call Back from a remote 
node. This is because the c overage point’s system has no way of knowing 
whether the caller can respond to Leave Word Calling. For example, the 
coverage point’s system does not know whether the c alling party is a trunk 
or a station.
nDisplays
DCS Call Coverage interacts with displays as follows. Displays on the 
coverage point’s terminal can appear different than...