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Access and Peer SBCs

A VoIP service provider can deploy two logically separated SBCs (access and peer SBCs) in their service network, depending on where the SBC is located. The reason for the logical separation is that the function of each SBC is generally different because of different issues and policies.

  • Access SBC— An access SBC is located on the border between the service provider’s core network and access network in order to deal with border issues. Because the VoIP traffic comes from an unmanaged public network, an access SBC must have strict policies for a DoS attack, flooded call, malformed message, and spoofed call. Moreover, it must have the capability to apply the policy to individual users/devices; for example, only the misbehaving end device is supposed to be demoted (no call processing), without affecting other devices.

  • Peer SBC— A peer SBC is located on the border between the service provider’s core network and peer network in order to manage border issues. Because the traffic comes from a relatively safe network, typically through a VoIP trunk, it does not really require strict policy. It must have a capability of applying different policies to different peer networks.


  

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