H3C Technologies H3C MSR 5600 - Manual (Page 46)

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When the circuit is idle, the originating side sends a forward seizure signal (00) to the terminating
side, and the terminating side sends back a seizure acknowledgement signal (11). Then the circuit
is seized, and interregister signaling exchange begins. When the called party picks up the phone,
the terminating side sends a backward answer signal (01). After the originating side recognizes
the received signal, it establishes the call.
Figure 16 Call establishment
• Call release at the originating side.
The originating side sends a clear-forward signal 10. When the terminating side recognizes the
clear-forward signal, it sends a backward signal 10. When the originating side recognizes the
backward signal 10, it releases the call.
Figure 17 Call release at originating side
• Call release at the terminating side.
The terminating side sends a clear-back signal 11 to the originating side, and the originating side
sends back a clear-forward signal 10. When the terminating side recognizes the forward signal
10, it sends a release-guard signal 10. When the originating side recognizes the release-guard
signal 10, it releases the call.
Figure 18 Call release at terminating side