RTP Control Protocol (RTCP)

A supervisory protocol for RTP that can provide information about the quality of a call.

Real-Time Transport Protocol (RTP)

The protocol that carries voice packets.

Registration, Admission, and Status (RAS)

The protocol used to communicate with a Cisco H.323 gatekeeper.


A measurement indicating the likelihood that a packet can successfully traverse a network without being dropped.


The process of copying database information from a publisher server to subscriber servers.

ring back

The ringing sound heard by a caller to indicate that the dialed phone is ringing.

ring cadence

The ringing pattern that specifies the on-off duration in a ring pattern.

ring number

The number of rings received on an FXO port before the port answers a call.


A type of supervisory signaling that lets a called party realize they are receiving a call.

robbed-bit signaling

Used with channel-associated signaling, where framing bits are robbed from a Super Frame or an Extended Superframe and used for signaling bits.

root bridge

A switch in the Layer 2 network running the Spanning Tree Protocol that serves as the point to which other switches forward traffic.

round robin

A type of hunt group, where incoming calls are sent to the first available number in a list of numbers.

RTP Header Compression (cRTP)

A QoS mechanism that logically compresses the size of a voice packet's header down to only 2 or 4 bytes.


CallManager data including such information as calls in progress, gateway and IP phone registration, and information about DSP resources.

Voice over IP First-Step
Voice over IP First-Step
ISBN: 1587201569
EAN: 2147483647
Year: 2005
Pages: 138
Authors: Kevin Wallace

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