- 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.
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