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CPE Signaling Model

November 2009

338

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.