Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1440

Multifrequency Signaling 

■

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.

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, classified 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).

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