See Also
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.