Method (130) for optimizing emergency call service in a Virtual Local Area Network including at least one Voice over Internet Protocol device. A range of port numbers is reserved for use during emergencies (134). Next, a VoIP device transmits an emergency call within the VLAN using a port in the specified...http://www.google.de/patents/US7099332?utm_source=gb-gplus-sharePatent US7099332 - Emergency calling with a VoIP device in a VLAN environment
