The process of taking snapshots, or samples, of an analog voice waveform and representing those snapshots in binary.

Secure Real-Time Transport Protocol (SRTP)

A protocol that transports encrypted voice packets.

session initiation protocol (SIP)

A gateway control protocol that uses the concept of inviting participants into a session.


A QoS mechanism that limits the bandwidth used by an application, typically by delaying excess packets.


Information about a phone's status or a call's status (for example, ringing, loop start signaling, or a busy signal).

signaling protocol

A set of rules used to communicate call setup information.

Signaling System 7 (SS7)

The signaling protocol used between PSTN switches.

Simplified Messaging Desk Interface (SMDI)

A protocol that runs between a Cisco CallManager server and a Catalyst switch, allowing a legacy voice mail system to be used in an IP telephony environment.

Skinny Client Control Protocol (SCCP)

The protocol used to communicate between Cisco IP phones and Cisco CallManager servers.


A key on an IP phone that can serve different functions at different times (for example, hold, transfer, or conference).

Spanning Tree Protocol (STP)

A mechanism for preventing Layer 2 switching loops, while allowing redundant Layer 2 network connections.


A device used to interface with the telephony network, such as an analog phone or fax machine.


A CallManager server that contains a read-only copy of the CallManager database and receives updates from a publisher server.

Super Frame

A grouping of 12 standard 193-bit frames into a single frame.

Survivable Remote Site Telephony (SRST)

A technology that allows a router at a remote site to take over call processing functions from the Cisco CallManager if the IP WAN goes down.

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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