RAS: short for Registration, Admission and Status, is a management protocol tool used for VoIP Gateways and VoIP Gatekeeper endpoints.
Router: a network device that also acts as a hub or switch. See VoIP router - these types of routers provide LAN, WAN, FXS and FXO ports.
RRSV : stands for Resource Reservation Protocol.
RTP : short for Real-Time Transport Protocol.
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