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CCNA Voice Key Terms

640-461

TermDefinition
analog signal A method of signaling that uses properties of the transmission medium to convey sound characteristics, such as using electrical properties to convey the characteristics of voice.
loop start signaling A method of signaling that relies on connecting the tip and ring wires connecting to a device to complete an electrical circuit; typically used in devices connecting to the PSTN.
ground start signaling A method of signaling that relies on grounding wires connecting to a device to signal a new call; typically used in PBX systems to avoid glare.
glare An instance in which a user picks up a phone and connects unexpectedly to an incoming call.
time-division multiplexing (TDM) A method of transmitting multiple channels of voice or data over a single digital connection by sending data in specific time slots.
channel associated signaling (CAS) A method of digital signaling in which signaling information is transmitted using the same bandwidth as the voice.
common channel signaling (CCS) A method of signaling in which information is transmitted using a separate, dedicated signaling channel.
robbed bit signaling (RBS) An implementation of channel associated signaling (CAS) that steals the eighth bit of every sixth frame of a digital T1 circuit for signaling information.
Q.931 A signaling protocol used by ISDN CCS implementations.
local loop The PSTN link between the customer premises (such as a home or business) and the telecommunications service provider.
private branch exchange (PBX) A system that allows a company to run an internal, private voice network; PBX systems are usually used in larger companies and provide unique extensions to all devices.
key system A system that allows a company to run a private, internal voice network; key systems are usually used in smaller companies and provide shared-line extensions to all devices, although many key systems now provide unique extensions to all devices.
Signaling System 7 (SS7) The protocol used within the telephony service provider network to provide inter-CO communication and call routing.
E.164 An international numbering plan created by the ITU and adopted for use on the PSTN.
quantization The process of assigning analog signals a numeric value that can be transported over a digital network.
Nyquist theorem Describes the method of converting analog audio signals into digital format by sampling at twice the highest frequency of the audio.
mean opinion score (MOS) A subjective method of determining voice quality; listeners hear a phrase read over a voice network and rate the quality of the audio on a scale of 1 to 5.
G.711 Uncompressed audio codec consuming 64 kbps of bandwidth.
G.726 Compressed audio codec consuming 32 kbps of bandwidth.
G.728 Compressed audio codec consuming 16 kbps of bandwidth.
G.729 Compressed audio codec consuming 8 kbps of bandwidth.
Real-time Transport Protocol (RTP) The UDP-based protocol responsible for transporting audio packets; uses random, even-numbered UDP ports from 16,384 to 32,767 for communication.
Real-time Transport Control Protocol (RTCP) The UDP-based protocol responsible for transporting audio statistics; uses random, odd-numbered UDP ports from 16,384 to 32,767 for communication.
Cisco Unified Communications Manager (CUCM) The multiserver call processing platform that is able to support up to 30,000 users per cluster.
Cisco Unified Communications Manager Express (CME) The call processing platform that is able to support up to 250 users (depending on router hardware).
Cisco Unity Connection The single-server unified messaging platform that is capable of supporting up to 7,500 users.
Cisco Unified Presence Provides status and reachability information for the users of the voice network.
Skinny Client Control Protocol (SCCP) Cisco-proprietary voice-signaling protocol used to control Cisco IP phones.
Session Initiation Protocol (SIP) Voice-signaling protocol created by the IETF as a lightweight alternative to H.323.
Internet Telephony Service Provider (ITSP) Provides VoIP trunk connectivity to the PSTN to provide a cost savings over traditional telephony service providers (TSP).
digital signal processors (DSP)
Cisco Unity Express (CUE) The unified messaging platform that is integrated into a Cisco Unified CME router; capable of supporting up to 250 users.
interactive voice response (IVR) An automated system that provides a recorded, automated process to callers accessing your voice network.
Voice Profile for Internet Mail (VPIM) A feature that allows one voicemail system to exchange messages with another voicemail system.
802.3af Power over Ethernet (PoE) Industry-standard method of supplying power over an Ethernet cable to attached devices.
Cisco Inline Power Cisco-proprietary, prestandard method of supplying power over an Ethernet cable to attached devices.
Cisco Discovery Protocol (CDP) Protocol that allows Cisco devices to discover other, directly attached Cisco devices. Switches also use CDP to send voice VLAN information to attached IP phones.
virtual LAN (VLAN) A configuration used to break a switch into multiple broadcast domains and IP subnets.
trunking A Cisco-proprietary protocol that replicates VLAN database information to all switches participating in the same VTP domain.
802.1Q An industry-standard trunking protocol that allows traffic for multiple VLANs to be sent between switches.
Dynamic Trunking Protocol (DTP) Allows switches to dynamically negotiate trunk links.
Network Time Protocol (NTP) Synchronizes the clock of a network device to a more accurate NTP server.
Dialed Number Identification Service (DNIS) Describes dialed number information delivered to a voice processing device. Closely related to Automatic Number Identification (ANI), which identifies caller ID information.
Automatic Number Identification (ANI) Describes caller ID information delivered to a voice-processing device.
dial-peer Logical configuration used to define dial plan information on a Cisco router.
Foreign Exchange Station (FXS) ports Analog interfaces that allow you to connect a legacy analog telephony device to a VoIP network.
Foreign Exchange Office (FXO) ports Analog interfaces that allow you to connect a VoIP network to legacy telephony networks such as the PSTN or a PBX system.
Private Line Automatic Ringdown (PLAR) A configuration used to enable “immediate dial” applications, such as a phone that immediately dials an emergency number when a user lifts the handset.
Direct Inward Dial (DID) A voice configuration that allows users from the PSTN to dial directly into an individual phone at an organization without passing through a receptionist or automated attendant application.
Class of Restriction (COR) The method used to implement calling restrictions in the CME environment. An inbound COR list assigns privileges, whereas an outgoing COR list restricts calling.
local directory The directory that is built automatically by the CME router as you define caller ID information for the ephone-dns.
H.450.3 Industry-standard method of forwarding calls without hairpinning.
H.450.2 Industry-standard method of transferring calls without hairpinning.
hairpinning A problem that occurs when a call is transferred or forwarded from one IP phone to another that keeps the audio path established (or hairpinned) through the original IP phone; this tends to cause QoS issues with the call.
call park A Cisco Unified CME feature that allows you to park a call on hold in a virtual “parking spot” until it can be retrieved.
call pickup A Cisco Unified CME feature that allows you to answer another ringing phone in the network.
directed pickup A method used with call pickup to answer a phone directly by dialing the extension number of the ringing phone.
local group pickup A method used with call pickup to answer a ringing phone from within the local group of an IP phone.
other group pickup A method used with call pickup to answer a ringing phone from another group number, which must be specified after pressing the GPickUp softkey.
Single Number Reach A feature that allows users to have incoming calls ring another, preconfigured number after a defined time limit. Single number reach also allows for mobility, which allows the transfer of an active call to or from the same, preconfigured number.
role (CUCM) Defines a set of privileges to an application’s resources. Privileges may be defined as No Access, Read, or Update.
resource May be an administrative web page, part of a web page, or a tool or interface within an application.
Created by: colyons1992