The delivery of emergency services to users of a set of communication devices in a packet-switched network is enabled by a method that determines a routing key corresponding to a particular directory number that is associated with a particular communication device, and stores the directory number and...http://www.google.es/patents/US7953209?utm_source=gb-gplus-sharePatente US7953209 - Provisioning of emergency services in a voice-over-packet environment
Provisioning of emergency services in a voice-over-packet environment
