David, Here at Michigan State University, for desktop clients (Windows and Mac), we require softphone users to self-identify their 911 location using 911 Secure. This software allows the user to report their current 911 location when the pc starts up or whenever it detects a network connection change.
For softphone users on a cellular device, you can configure the settings file to send 911 calls out the phones cellular network which of course uses latitude and longitude to determine your location.
Christopher Grewe Unified Communications Team
email firstname.lastname@example.org | office/cell/fax/SMS - (517) 884-7999
Michigan State University Information Technology | 169 Service Road, STE 104, East Lansing, 48824
450 10th Circle N
Nashville, TN 37203
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