Office Communications Server 2007 R2 enables an enterprise to connect its voice network directly to an Internet telephony service provider (ITSP) offering public switched telephone network (PSTN) origination and termination over the Internet. This voice configuration eliminates the need for an IP-PSTN gateway to provide PSTN connectivity. This configuration is referred to as SIP trunking. This article is a one-stop shop of links to information about SIP trunking with Office Communications Server 2007 R2.

Author: Dr. Rez

Publication date: December 2009

Product version: Microsoft Office Communications Server 2007 R2

Office Communications Server 2007 R2 simplifies and reduces the cost of deploying Enterprise Voice by enabling an enterprise to connect its voice network directly to an Internet telephony service provider (ITSP) offering public switched telephone network (PSTN) origination and termination over the Internet. This voice configuration is attractive because it simplifies the deployment by eliminating the need for an IP-PSTN gateway to provide PSTN connectivity. This type of configuration is referred to as SIP trunking.

The Office Communications Server 2007 R2 SIP trunking capability enables the following scenarios:

  • An enterprise user inside or outside the corporate firewall can make a local or long-distance call specified as an E.164-compliant number that is terminated on the PSTN by the corresponding service provider.
  • Any PSTN subscriber can contact an enterprise user by dialing a Direct Inward Dialing (DID) number associated with that enterprise user.

This article provides links to the information published so far regarding SIP trunking with Office Communications Server 2007 R2.

Get in touch with your ITSP for the specific information about how to establish a SIP trunk to their service. For a list of ITSP or SIP trunking service providers who are approved for use with Communications Server, see the Microsoft Unified Communications Open Interoperability Program at http://go.microsoft.com/fwlink/?linkid=133622.

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