S


sampling

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.



shaping

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



signaling

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.



softkey

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.



station

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



subscriber

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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