The voice feature uses gates to control voice flows in the transport plane. Gates are created through signaling instructions that the PGC provides to the PG. Using the signaling instructions, the PG defines gates to allow, drop, or manipulate voice flows as they traverse the router.
Each gate provides a unidirectional voice flow. A pair of gates provides a bidirectional voice flow. Figure 15 shows a unidirectional gate.
Figure 15: Unidirectional Gate
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