Topic Last Modified: 2010-11-03

Before you configure Microsoft Lync Server 2010 for E9-1-1, you need to decide how broad your deployment will be. Some of the questions to consider include:

What areas within your enterprise need to be enabled for E9-1-1?

You can enable E9-1-1 for selected locations or across the entire enterprise. For example, you may want to limit E9-1-1 support to a specific number of buildings, or even a specific number of floors within a building. You may also have different E9-1-1 requirements for offices located in different states or countries.

Will you deploy E9-1-1 to branch offices?

Branch-site voice resiliency is an important concept to understand when deploying E9-1-1 at a Branch office. If you have centralized SIP trunks and a WAN outage, clients signing in may not be able to obtain a location, or connect to the Emergency Services Service Provider. Lync Server 2010 provides several strategies for handling Voice resiliency in branch offices including: having resilient data networks, deploying a SIP trunk at each branch, or pushing calls out to the local gateway during outages. For details, see Planning for Branch-Site Voice Resiliency.

Will you enable E9-1-1 for users working outside the network?

For example, will you enable users if they are working from home or from the airport? If a client is located outside the enterprise network, the client can be configured to prompt the user for a location. Automatic location acquisition is only available for clients located inside of the network.

Do you want to provide emergency call routing based on network location?

You may want to provide emergency routing to areas of your company not served by an Emergency Services Service Provider (for example, international locations). To do this, create new site, and then assign dial plans to the sites that refer to a PSTN usage that is routed out through the local gateway.