[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-08

Microsoft Communications Server 2010 supports Enhanced 9-1-1 (E9-1-1) as part of an enterprise deployment. E9-1-1 is an emergency notification feature that associates the calling party’s telephone number with a civic or street address. Using the location information, the Public Safety Answering Point (PSAP) can immediately dispatch emergency services to the caller in distress.

For static phone lines, the association between the calling party Directory Number and the location is constant. This means that if the address is defined ahead of time, the Public Safety Answering Point (PSAP) can always match a number to a location. In contrast, a VoIP endpoint can be dynamic, receiving voice service over any available wired or wireless network. Whenever the endpoint moves to a new location, the location needs to be redefined. In a Communications Server 2010 deployment, clients can roam freely inside and outside of the network. This means that in order to support E9-1-1, Communications Server must be able to correctly determine the location of the clients, wherever they are, and ensure that the PSAP has the correct address should an emergency call be dialed from the client.

The topics in this section describe how locates clients inside or outside of the network and how this information is used to route a call to the correct PSAP, as well as discuss deployment options.

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