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Opening, Closing, and Modifying Gates Overview

Based on information acquired through VoIP signaling, the PGC instructs the packet gateway through PGCP commands which gates to create and which actions to associate with them. Each gate can have many actions associated with it; for example, NAT, Differentiated Services (DiffServ) code point (DSCP) marking, and latching. The pgcpd process decodes PGCP commands that it receives from the PGC and uses IPC messages to instruct the PIC to create, delete, or modify gates and apply required actions to each gate.

The following IPC messages are exchanged between the pgcpd process and the PIC:

Gate open request
Gate close request
Gate audit request
Gate modify request
Gate open reply
Gate close reply
Gate audit reply
Gate modify reply
Gate notification reply

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