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VPN Aggregation for VoIP Calls Overview
The VPN aggregation feature uses VPN routing and forwarding
(VRF) so users on one VPN can call users on another VPN. For example,
in Figure 22, users in
VPN B can call users in VPN A and VPN C.
Figure 22: VPN Aggregation
in a VoIP Network
VPN aggregation provides the following benefits:
- Provides a scalable way to configure VRFs in a mesh-like
configuration that uses only one logical service interface for each
VRF.
- Reduces the number of service sets that you need because
you can add all of your logical service interfaces to a pool of interfaces,
and then assign the entire pool of interfaces to a service set.
- Configurations are inline so, when you provision the service
set for VRFs, you can seamlessly tie the service into the PGCP service
without the need for additional configuration states.
- Uses the router’s native support for VRFs and VPNs,
which omits the need for an external element that terminates the VRFs
and replaces them with the VLAN tags required to support VoIP media
handling.
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