A Resource ReSerVation Protocol (RSVP) proxy is used in combination with a signaling proxy to provide improved admission control, Quality of Service (QoS) reservation, and media path routing. This avoids entangling call signaling with media plane functions as required with Session Border Controllers...http://www.google.co.uk/patents/US20070008882?utm_source=gb-gplus-sharePatent US20070008882 - Method and apparatus for network-based admission control using path-coupled quality of service signaling
