New SIP Trunking Support

Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.

Office Communications Server 2007 R2 simplifies and reduces the cost of deploying Enterprise Voice by enabling an enterprise to connect its voice network to a service provider offering PSTN origination and termination. This capability, a variety of what is known in the telecommunications industry as SIP trunking, means that enterprises do not need to deploy IP-PSTN gateways in order to enable PSTN connectivity.

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 by an E.164-compliant number that is terminated on the PSTN as a service of the corresponding service provider.

• Any PSTN subscriber can contact an enterprise user inside or outside the corporate firewall by dialing a Direct Inward Dialing (DID) number associated with that enterprise user.