Dialogic 6.2 manual November 339

CPE Signaling Model

Table 17. Line Signaling Model (Continued)

State	CAS Bits		Notes
	Outbound AB	Inbound AB
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	10	11	This state is optional. The inbound
(Optional; refer to			side responds to the clear forward
			with a clear back signal and holds it
network
			for a specified length of time.
specifications)
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.

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

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