Dialogic 6.2 Manuale Utente

CPE Signaling Model

November 2009

339

The inter-register signaling performs the exchange of address 

information via R2 MF tones. The split-band forward and backward 

tone sets allow the definition of sets of forward and backward 

protocol signals. The exchange is performed in a compelled manner 

with the outbound channel sending a forward address signal that is 

acknowledged by a backward signal that itself directs the 

transmission of the next piece of address information. Information 

passed from the outbound side to the inbound side is:

„

DNIS digits (Dialed Number Identification Service) representing 

the called party

„

ANI digits (Automatic Number Identification) representing the 

calling party

„

DNIS category (a.k.a. Call, Group II, or Toll category)

„

ANI category (a.k.a. Caller, User, or Group I category)

„

Circuit type (terrestrial or satellite)

„

Half echo-suppressor to be used or not used

Idle

10

10

Inbound side sends the idle signal.

Disconnection initiated by the outbound side.

Clear forward

10

01

Outbound side sends the clear 

forward signal.

Release guard
(Optional; refer to 

network 

specifications)

10

11

This state is optional. The inbound 

side responds to the clear forward 

with a clear back signal and holds it 

for a specified length of time.

Idle

10

10

Inbound side sends the idle signal.

Channel blocking is implemented according to ITU recommendations for “both-way” trunks. 

The side performing the blocking is considered the inbound or backward channel.

Idle

10

10

Both ends of the channel are idle.

Blocked

10

11

Blocking signal is transmitted.

Idle

10

10

Blocking signal is removed and 

both ends are in the idle state.