R2511-HP MSR Router Series Voice Configuration Guide(V5)

Figure 19 R2 digital line signaling – call establishment

2. Originating side releases the call.

The originating side sends a clear-forward signal 10. When the terminating side recognizes the

clear-forward signal, it sends a backward signal 10 (release guard signal or clear-forward

acknowledgement signal). After the originating side recognizes the backward signal 10, it

releases the circuit.

Figure 20 R2 digital line signaling – originating side releases the call

3. Terminating side releases the call.

The terminating side sends a clear-back signal 11. After the originating side receives the

clear-back signal, it sends a clear-forward signal 10. After the terminating side recognizes the

forward signal 10 sent by the originating side, it sends a backward signal 10. After the

originating side recognizes the backward signal 10, it releases the circuit.

Figure 21 R2 digital line signaling – terminating side releases the call

4. Line released by forced release signal.