As shown in Figure 11, the two main components of the voice solution are the packet gateway controller (PGC) and the packet gateway (PG). The PGC and the PG communicate over the Packet Gateway Control Protocol (PGCP).
Figure 11: Voice Solution Architecture
The PGC is an external device that controls the PG on the router. The PGC requests media services and resource allocation from the PG, and it uses those services and resources for VoIP call signaling setup. The PGC maintains awareness and control over the network’s transport resource using PGCP connections with all of the PGs in the network.
The packet gateway feature on the router provides Interconnect-BGF transport services for VoIP sessions. The packet gateway feature consists of:
The PG and the PGC communicate over a Packet Gateway Control Protocol (PGCP) connection. PGCP is an H.248 v3 protocol with Juniper Networks extensions. PGCP is compliant with Gateway control protocol v3, ITU T Recommendation H.248.1, September 2005.
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