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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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SIP Trunk

The connection to the Emergency Services Service Provider is accomplished through a dedicated SIP trunk. Emergency providers can only accept calls from a single Mediation server, so if a pool of Mediation servers exists already, an additional, standalone Mediation server must be deployed to support E911 to the Emergency Services Service Provider.

To provide resiliency for E911, an additional SIP trunk to a different Mediation server must be provisioned. This ensures that if the primary SIP trunk or Mediation server is unavailable, E911 calls can still be delivered correctly. This additional trunk can be in the same location or, ideally, in a different site, to ensure site survivability. When provisioning the SIP trunk, a VPN tunnel ...

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