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Application Scenarios for the SIP AG
Using SIP AGs as Voice Gateways
As shown
in Figure 3-7, a SIP AG functions
as an IP voice gateway to implement communication between the IP network
and the PSTN or ISDN. The usage scenarios are as follows:
- The SIP AG connects small-scale and distributed enterprise users to analog phones or fax machines to implement voice communication.
- The SIP AG is registered with the IMS. Then the IMS provides and controls user services on the SIP AG.
Connecting to the PSTN Through a Trunk
As shown in Figure 3-8, a SIP AG connects to a PBX through a PRA trunk and to an ISDN phone through a BRA interface.
