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Application Scenarios for the SIP AG
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.
Figure 3-7 Networking where the SIP AG functions as the voice gateway
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.
Figure 3-8 SIP AGs connect to the PSTN through a trunk