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Charter (1/3) In a number of areas the public switched telephone network (PSTN) has been configured to recognize an explicitly specified number (commonly one that is short and easily memorized) as a call for emergency services. These numbers (e.g. 911, 112) relate to an emergency service context and depend on a broad, regional configuration of service contact methods and a geographically constrained context of service delivery. These calls are intended to be delivered to special call centers equipped to manage emergency response. Successful delivery of an emergency service call within those systems requires both an association of the physical location of the originator with an appropriate emergency service center and call routing to deliver the call to the center. Calls placed using Internet technologies do not use the same systems to achieve those goals, and the common use of overlay networks and tunnels (either as VPNs or for mobility) makes meeting them more challenging. |