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In a hosted IP communications services model, 

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

The 

Spacevars
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 deployed in the Service Provider network secures controls and segregate Service Provider infrastructure whereas the

Spacevars
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deployed in an Enterprise network controls and safeguards the SIP trunking border that connects the enterprise and service provider. Also the

Spacevars
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's normalization features help Enterprises avoid hosted service interoperability issues.

Caption
0 Figure 1 Hosted Enterprise IP Communication Services
Note
The example graphic depicts SBC 5000 series, but all the platforms are supported.

SBC in a Carrier-hosted IP-PBX

Caption
0 Figure 1 Carrier-Hosted IP-PBX

The

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

• An enterprise

  Spacevars
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  can sometimes exhibit characteristics that are similar to Access/UNI

  Spacevars
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  and other times more like a Trunking/NNI

  Spacevars
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  .
• The enterprise may implement

  Spacevars
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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

   Spacevars
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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.

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