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In an enterprise integrated 

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 scenario, the 
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 is deployed before an IP PBX. The enterprise uses one or more trunks provided by the service provider to connect to the PSTN network.

An

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deployed in the enterprise network provides the following benefits:

  • Call admission control to the enterprise network at the border.
  • The enterprise IP network topology and endpoint characteristics are visible to the PSTN endpoint.
  • Demarcation point for SP hand-off and troubleshooting purposes.
  • QoS and codec selections are under control of the enterprise.
  • Protection against DOS attacks against SIP.
  • SIP normalization – normalizing SIP messaging on the network border or between two unrelated devices within the network that support SIP.
  • Toll-fraud control point.

 

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