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Considerations for the Call Vectoring Features
C-4 Issue 4 September 1995
■ It is perfectly acceptable for a vector to route a call over an ISDN-PRI
facility to a destination that is not a VDN. In such a case, the sending
switch treats the call like a Look-Ahead Interflow call. Generic ISDN
processing at the receiving switch causes the call to be accepted. The
DNIS name is ignored.
■ If a Look-Ahead Interflow call terminates to a VDN on a receiving switch
where the Look-Ahead Interflow option is
not
enabled, intelligent interflow
still results. However, any relevant DNIS information is ignored, and
intelligent interflow to far-end switches is not possible.
■ The LAI timeout in the sending switch occurs after two minutes.
■ T-1 equipment might modify the ISDN D-channel that is used for Look-
Ahead Interflow. If multiplexors are introduced into the ISDN-PRI circuit,
bit compression and echo cancellation must be turned off for the D-
channel.
Adjunct Routing Considerations
The following are considerations you should keep in mind when working with
Adjunct Routing:
■ Depending upon your application, you may want to include a second
adjunct routing
step in your vector in case the first such step fails.
■ If you include an
announcement
step immediately after an
adjunct routing
step, be sure the announcement does not contain any information
essential to the caller (such as further instructions) since the step following
the
adjunct routing
step immediately terminates the moment the switch
receives a destination from the ASAI adjunct.
■ If you include a
wait-time
step after an
adjunct routing
step, it is a good
idea to specify either
ringback
or
music
(and not
silence
) as the feedback.
If the caller does not hear any feedback, he or she might give up on the
call and hang up.
■ The second step after the
adjunct routing
step could (and, in many cases,
should) be implemented as a default treatment in case the host
application or ASAI link is down. The step containing this default treatment
(for example,
route-to number 0 if unconditionally
) executes immediately if
the ASAI link is down and if the step is preceded by either a
wait-time
or
an
announcement
step. On the other hand, if the host application is down,
the default step executes only if the application does not respond with a
route within 20 seconds.