DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Features and technical reference
1440Multifrequency Signaling
20
■If DEFINITY ECS makes an outgoing call to the CO that uses an open
numbering plan, the CO should send the signal A.1 to DEFINITY ECS
after sending the last address digit to the CO. Then, the CO should timeout
and send a pulsed signal A.3 to DEFINITY ECS requesting the Group II
signal.
Guidelines for administering MF signaling
To administer MF signaling, first you identify the origination switch and the
destination switch. (The switch making the call is the origination switch; the
switch answering the call is the destination switch.)
■The origination switch creates forward signals, classified as group I and
group II signals.
■The destination switch creates backward signals, class ified as group A and
group B signals.
Group I and group A signals comprise the basic signaling for the dialed number.
More elaborate signaling requires Group II and group B signals. Signal meanings
and timer values can be administered.
The sequence below shows a typical interaction between the origination (forward
group I and group II signals) and destination switch (backward group A and group
B signals).
Forward Backward
Group I digit -->
<-- A.1 Group A
digit -->
<-- A.1
digit -->
<-- A.1
digit -->
<-- A.1
digit -->
<-- A.3 End of dial
Group II II.2 -->
<-- B.x Group B