CPE Signaling Model

 

 

 

 

 

 

 

Table 17. Line Signaling Model

 

 

 

 

 

 

 

State

CAS Bits

 

Notes

 

 

 

 

 

 

 

Outbound AB

Inbound AB

 

 

 

 

 

 

 

Idle

10

10

Both outbound and inbound

 

 

 

 

channels are sending idle signal.

 

 

 

 

 

 

Seize

00

10

Outbound channel seizes the line.

 

 

 

 

 

 

Seize Acknowledge

00

11

Inbound channel initializes MFC

 

 

 

 

inter-register signaling and sends

 

 

 

 

the seize acknowledgment. When

 

 

 

 

the seize acknowledgment is

 

 

 

 

recognized by the outbound

 

 

 

 

channel, inter-register signaling

 

 

 

 

begins with the transmission of the

 

 

 

 

first DNIS digit.

 

 

 

 

 

If the call is accepted by the inbound side via the inter-register signaling, the answered state is entered.

Answer

00

01

 

 

 

 

 

Answer

00

11

Metering pulses are possible. In

 

 

 

this example the pulse is

 

 

 

transmitted on the A bit. The

 

 

 

outbound side must not confuse

 

 

 

this with a clear back signal.

 

 

 

 

Answer

00

01

Metering pulse over, inbound

 

 

 

resumes transmission of the

 

 

 

answer signal.

 

 

 

 

If the call is rejected by the inbound side via the inter-register signaling, the outbound side is responsible for clearing the call.

Clear forward

10

11

Outbound side sends clear forward.

 

 

 

 

Idle

10

10

Inbound side sends the idle signal.

 

 

 

 

Disconnection initiated by the inbound side.

 

 

 

 

 

Clear back

00

11 or 00

The hang-up might be signaled by a

 

 

 

clear back (AB=11) or by a forced

 

 

 

release (AB=00), as indicated by

 

 

 

network specifications.

 

 

 

 

Clear forward

10

11 or 00

Outbound side sends the clear

 

 

 

forward signal.

 

 

 

 

November 2009

338

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Image 338
Dialogic 6.2 manual Line Signaling Model State CAS Bits Outbound AB Inbound AB, November 338