Cisco 350-801 CLCOR key terms

The first node installed in a CUCM cluster. It holds the master configuration database and replicates changes to all other nodes, making it the primary point of administration for the cluster.

An additional cluster node that registers endpoints and runs call-processing services while keeping a read-write copy of the database. It can handle call processing if the publisher becomes unavailable.

A grouping of phones, gateways, and trunks that share settings such as region, location, date/time group, and SRST reference. Assigning a pool pushes those settings to every member device.

A built-in backup and restore application that captures cluster configuration, CDR data, and certificates on a schedule so a CUCM cluster can be rebuilt after a failure.

A CUCM service that issues locally significant certificates to endpoints and installs them on the device. Those certificates enable encrypted signaling and authenticated secure media.

A CUCM tool that inserts, updates, deletes, or exports large numbers of phones, users, lines, and other objects from CSV files, avoiding repetitive manual entry in the GUI.

A pair of Expressway-C (inside) and Expressway-E (outside) appliances that let Jabber and Webex clients register to on-premises CUCM from outside the network without a VPN.

An IETF text-based signaling protocol that creates, modifies, and ends multimedia sessions. CUCM uses it for trunks, many endpoints, and line-side calling features.

Cisco's proprietary TCP-based stimulus protocol between phones and CUCM. The phone reports button presses and the server sends display and audio-path instructions, keeping call logic centralized.

An ITU-T suite of protocols for multimedia conferencing over packet networks. In CUCM it is mainly used for H.323 gateways and intercluster trunks.

A gateway control protocol in which a call agent such as CUCM controls individual voice ports on a gateway. The gateway is stateless, so dial-plan intelligence stays on CUCM.

A text format carried inside SIP messages listing media capabilities such as codecs, IP address, ports, and direction. The offer/answer exchange using SDP negotiates the actual media session.

The UDP transport for real-time audio and video. It adds sequence numbers, timestamps, and payload type identifiers so receivers can reorder packets and absorb jitter.

RTP with encryption, message authentication, and replay protection for the media stream. Secure calls use it for audio and video while signaling is protected separately.

A cryptographic protocol that encrypts and authenticates signaling connections. SIP over TLS commonly uses TCP port 5061 to protect registration and call setup between CUCM and its peers.

A narrowband 64 kbps pulse-code-modulation codec with a-law and mu-law variants. It consumes almost no DSP capacity and is the usual baseline for high-quality on-net calls.

A narrowband codec that compresses speech to 8 kbps using CS-ACELP. It saves WAN bandwidth but adds delay and requires DSP resources when converted to G.711.

Methods for carrying touch-tone digits. RFC 2833/4733 sends digits as RTP events, KPML sends them in SIP signaling, and in-band audio tones are the fallback when neither is supported.

A feature where a new phone downloads its configuration, prompts the user for an ID and PIN, and is then built automatically with lines and settings taken from a universal device template.

A template supplying common phone settings such as device pool, location, and button template, used to build devices automatically instead of configuring each phone by hand.

A feature that lets a user log in to a supported phone so the device temporarily takes on that person's lines, speed dials, and settings from a stored profile.

A container holding a user's lines, speed dials, and phone settings for Extension Mobility. It is applied to a phone when the user logs in and removed when they log out.

Defines the physical button layout for a phone model, including how many lines appear, which speed dials exist, and where features sit. It must match the model being configured.

A set of SIP parameters such as timers, headers, transport, DTMF method, and early-media behavior applied to SIP phones and trunks so device behavior can be standardized.

A logical folder holding dialable patterns such as directory numbers, route patterns, and translation patterns. A partition is reachable only when it is listed in a calling search space.

An ordered list of partitions that defines which dialed numbers a device or line may reach. CUCM searches the listed partitions in order for the best matching pattern.

A string of digits and wildcards that matches dialed numbers and sends them to a route list, gateway, or trunk, applying digit stripping, prefixing, and calling-party transformations along the way.

An ordered collection of gateways or trunks able to carry a call, together with a selection algorithm such as top-down or circular that chooses which device is tried.

An ordered list of route groups referenced by a route pattern. If the first route group is busy or fails, CUCM moves to the next, giving trunk failover and call distribution.

A pattern inside a partition that rewrites dialed digits or calling-party numbers before routing continues, often used to normalize numbers or permit and deny number ranges.

A number that receives incoming calls and distributes them across a hunt list of line groups using an algorithm such as longest idle or broadcast, so any free member can answer.

Also called Single Number Reach. It rings a user's desk phone and remote destinations such as a mobile at the same time, and the user can answer on either and move the call between them.

A media resource that terminates both call legs' RTP streams and relays them. It is inserted for SIP early media, DTMF conversion, or when endpoints share no common capability.

A DSP-backed resource that converts between codecs, for example G.729 on a WAN link and G.711 on the LAN, so endpoints with no shared codec can still hold a conversation.

A DSP or software resource that mixes the audio of several participants into a separate stream for each listener, enabling ad hoc and meet-me conferences.

A CUCM media resource that plays prerecorded prompts or text-to-speech messages to callers, such as a notice that a dialed number is not in service.

Audio played to a caller while the call is held. CUCM supports unicast and multicast delivery, file or fixed-device audio sources, and settings per device or per network.

An ordered list of media resource groups that a device uses to locate MTPs, transcoders, conference bridges, and annunciators, defining which resources are reachable and in what order.

A region sets the maximum codec, and therefore bandwidth per call, allowed between devices in different regions. Devices inside one region use that region's intra-region codec.

A location enforces call admission control by tracking bandwidth available between locations and blocking or rerouting calls that would exceed the configured audio and video limits.