Hosted Enterprise IP Communication Services

 

In a hosted IP communications services model, 

 is deployed both at the Service Provider and the enterprise network for security and control.

The 

 deployed in the Service Provider network secures controls and segregate Service Provider infrastructure whereas the deployed in an Enterprise network controls and safeguards the SIP trunking border that connects the enterprise and service provider. Also the 's normalization features help Enterprises avoid hosted service interoperability issues.

SBC in a Carrier-hosted IP-PBX

The

facilitates the registration of user equipment (UEs) located on the enterprise network to an IP-PBX in the carrier network. 

• An enterprise
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  can sometimes exhibit characteristics that are similar to Access/UNI
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  and other times more like a Trunking/NNI
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  .
• The enterprise may implement
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  capability on their network.
• Enterprise may have multiple business locations, these may need to be treated differently from a policy perspective.
• Users may be on a VPN from any internet access location.

Configuration Steps

1. UEs located on the enterprise network are configured to register via an
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   to an hosted IP-PBX in the carrier network.
2. In this configuration
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   acts in a manner similar to other access/IAD cases. However, there may be additional interoperability considerations with various vendors equipment.
3. The IP-PBX acts like a small AS, accepting registration from endpoints and offering services/features. Carrier may virtualize a PBX and support multiple customers on the same system.