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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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SIP Trunk Service Provider

The Emergency Services Service Provider is a third-party service that acts as a liaison between a Lync deployment and the PSAP via SIP trunk. It is important to clarify that Lync Server 2013 does not natively contact a Public Safety Access Point directly. Instead, it is the responsibility of the Emergency Services Service Provider to route the emergency calls to the correct PSAP.

Figure 32.12 displays the process that occurs when an emergency call is placed from a Lync endpoint. Lync 2013 provides an endpoint’s location to the Emergency Services Service Provider using the PIDF-LO format, which is really an XML blob containing all the detailed address information.

Figure 32.12. SIP trunk E911 service provider.

When ...

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