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In this model the 

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 is deployed both in the headquarters and the branch offices. In a private network the foremost issue is the security risk of attacks on infrastructure from inside the enterprise network. Another problem in a distributed model is incompatibility issues due to use of IP PBXs from multiple vendors which do not interwork. Sonus Ribbon

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s deployed in the private network borders protects and controls the private enterprise borders from internal security risks and incompatibility issues.

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0 Figure 1 Distributed SIP Trunk Model
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With distributed SIP trunk model, advantages include:

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