ATT DEFINITY Communications System Generic 3 Instructions Manual

Look Ahead Interflow
Issue  3   March 1996
3-847
Look Ahead Interflow Basics
When one switch has an overload of incoming calls, it may b ecome necessary to 
route some of the incoming calls to another switch so they can be handled more 
efficiently and will not be lost. Look Ahead Interflow is simp ly the means used to 
determine whether the other switch is able to handle the calls. When preset 
thresholds at one switch are reached (for example, the numb er of calls in queue), 
and another call comes in,...

Feature Descriptions
3-848Issue  3   March 1996 
Figure 3-24. Two-Switch Look Ahead Interflow Connections
Sending Switch Operation
As with standard vectoring interflow, outflow checking and outflow is 
accomplished by means of conditional goto
 and route-to vector commands. 
There are no unique vector commands for this feature. If the Look Ahead 
Interflow option is enabled, and the call is being routed over an ISDN-PRI facility, 
interflow will automatically be carried out on a look ahead basis. (There...

Look Ahead Interflow
Issue  3   March 1996
3-849
nCall Denial
If a call d enial message is returned by the receiving  switch b efore any call 
acceptance message, the sending switch will drop the Look Ahead 
Interflow call attempt and continue vector processing at the next vector 
step.
nTimeout
If a call acceptance or call denial message is not returned from the 
receiving switch within 10 seconds after the receiving switch receives the 
Look Ahead Interflow call request, the Look Ahead Interflow...

Feature Descriptions
3-850Issue  3   March 1996 
nTime of day/week
nNumber of calls in split’s queue
nNumber of seconds that the oldest call has been waiting in the split’s 
queue
nRolling Average Speed of Answer (G3V4 and later releases)
nActive VDN calls (G3V4 a n d later releases)
nExpected Wait Time (G3V4 and later releases)
nANI (G3V4 and  later releases)
nII-digits (G3V4 and later releases)
Once inflow checking is complete, acceptance of the look ahead call can b e 
accomplished by executing any of...

Look Ahead Interflow
Issue  3   March 1996
3-851
If, during inflow checking, the receiving switch decides that it is unable to accept 
the look ahead call, call denial can be accomplished by executing any of the 
vector commands listed in  Table 3-68. Use of the busy command is 
recommended over the disconnect command to allow for compati bility with 
network services.
q ueue-to main Call terminates to agent
or
Call queued for sp lit
route-toTerminates to valid local destination
or
Successfully seizes a...

Feature Descriptions
3-852Issue  3   March 1996 
The vector commands shown in Table 3-69 do not generate either call 
acceptance or denial messages and are considered neutral.
The following is an example of an inflow vector used by a receiving switch.
1. goto step 6 if staffed-agents in split 12 is <  3
2. goto step 6 if queued-calls in split 12 pri l is > 4
3. queue-to main split 12 pri h
4. wait-time 30 secs hearing music
5. stop
6. busy
Steps 1 and 2 do inflow checking. For split 12, if the numb er of...

Look Ahead Interflow
Issue  3   March 1996
3-853
Tandem Switch Configuration
Tandem Look Ahead Interflow can be accomplished with Call Vectoring and 
Look Ahead Interflow active at the receiving switch by using route-to 
commands that contain external destinations which use ISDN-PRI facilities.
An examp le of a tandem Look Ahead Interflow configuration is shown in Figure 
3-25. The o peration of the sending switch and the receiving switch are d escribed 
in the following paragraphs.
Figure 3-25. Look...

Feature Descriptions
3-854Issue  3   March 1996 
Great c are should b e taken by the vector programmer to ensure that the sending 
switch is not used as a backup location for the tandem switch or any of the far 
end switches. If administered in this manner, all trunk facilities could be tied up 
by a single call.
Example of Tandem Switch Vector
An examp le of a tandem switch vector follows:
1. goto ste p 4if staffed-agents in split 30 > 5
2. route-to  if unconditionally
3. busy
4. queue-to main split 30...

Look Ahead Interflow
Issue  3   March 1996
3-855
nIf redirection has occurred, display override rules do not take effect. The 
Look Ahead Interflow DNIS will contain the original VDN name, or, if 
multiple VDNs are accessed, the name of the VDN last accessed by 
means of a route-to vector command.
VDNs that ma p to vectors which place Look Ahead Interflow calls must have their 
ISDN CPN prefixes administered. Failure to administer the ISDN CPN prefix 
results in a Look Ahead Interflow DNIS of all spaces...

Feature Descriptions
3-856Issue  3   March 1996 
All calls routed over ISDN-PRI facilities by means of route-to number with 
cov n
 and route-to digits with cov n vector commands on a switch 
where the Look Ahead Interflow option is enabled are treated as Look Ahead 
Interflow call attempts.
Initial audible feedback may be provided to the caller before interflow is 
attempted. Therefore, another audible feedback from the receiving switch may 
not be appropriate. For exam ple, a caller hearing ringback on...