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.

deployed in the SP network secures controls and segregate SP infrastructure whereas the deployed 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
  Unable to show "metadata-from": No such page "_space_variables"
  can sometimes exhibit characteristics that are similar to Access/UNI
  Unable to show "metadata-from": No such page "_space_variables"
  and other times more like a Trunking/NNI
  Unable to show "metadata-from": No such page "_space_variables"
  .
• The enterprise may implement
  Unable to show "metadata-from": No such page "_space_variables"
  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
   Unable to show "metadata-from": No such page "_space_variables"
   to an hosted IP-PBX in the carrier network.
2. In this configuration
   Unable to show "metadata-from": No such page "_space_variables"
   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.