Voice Over Internet Protocol (VoIP) emergency calls to an Emergency Response Center (ERC) are handled through a VoIP conference bridge on a VoIP service provider's soft switch. The soft switch works with a VoIP positioning center (VPC) to obtain location information, which is compared against a PSAP...http://www.google.fr/patents/US7907551?utm_source=gb-gplus-shareBrevet US7907551 - Voice over internet protocol (VoIP) location based 911 conferencing
Voice over internet protocol (VoIP) location based 911 conferencing
