| Term | Description |
CAI | CAI - Common Air Interface; a standard developed for the UK’s public CT2 networks which enabled the same handset to be used on different networks
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Calendar | Calendar - Calendar feature allows you to store scheduling and event information in your phone. Some phones also offer the ability to sound an alert to remind you of upcoming events.
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Call barring | Call barring - A service which enables users to bar certain incoming or outgoing calls on their mobile phones
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Call divert | Call divert - The capability to divert incoming calls to another phone (fixed or mobile) or to an answering service
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Call hold | Call hold - The ability to put an ongoing call on hold whilst answering or making a second call
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Call timer | Call timer - A service which keeps track of the amount of airtime being used by the subscriber on a cumulative basis
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Caller ID | Caller ID - Caller Identification; displays the name/number of the person calling a mobile phone. Also known as CLI
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CAMEL | CAMEL - Customised Application for Mobile network Enhanced Logic; an IN feature in GSM networks that enables users to carry personal services with them when roaming into other networks that support CAMEL
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Capacity | Capacity - A measure of a cellular network’s ability to support simultaneous calls
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CB | CB - Cell Broadcast
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CC | CC - Call Control; manages call connections
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CCB | CCB - Customer Care and Billing
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CCCH | CCCH - Common Control Channels; a group of uplink and downlink channels between the MS and the BTS (see PCH, AGCH and RACH)
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CCS7 | CCS7 - Common Channel Signalling No. 7
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CDMA | CDMA - Code Division Multiple Access. A type of digital wireless technology that allows large amounts of voice and data to be transmitted on the same frequency. CDMA is second-generation cellular technology (or 2G) and is available in Canada, the United States, Pacific Asia, and Latin America. Most CDMA service providers will migrate to a high-speed data technology called 1xRTT. The CDMA phones are not listed on GSMArena.com.
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CDMA 1X | CDMA 1X - The first generation of cdma2000; the standardisation process indicated that there would be CDMA 2X and CDMA 3X but this no longer appears likely
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CDMA 1X EV-DO | CDMA 1X EV-DO - A variant of CDMA 1X which delivers data only
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CDMA2000 | CDMA2000 - A member of the IMT-2000 3G family; backwardly compatible with cdmaOne
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CDMAone | CDMAone - The first commercial CDMA cellular system; deployed in North America and Korea; also known as IS-95
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CDPD | CDPD - Cellular Digital Packet Data; a packet switched data service largely deployed in the USA. The service uses idle analogue channels to carry the packetised information.
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CDPSK | CDPSK - Coherent Differential Phase Shift Keying
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CDR | CDR - Call Detail Records; the record made within the cellular network of all details of both incoming and outgoing calls made by subscribers, The CDR is passed to the billing system for action
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Cell | Cell - The area covered by a cellular base station. A cell site may sectorise its antennas to service several cells from one locationCell siteThe facility housing the transmitters/receivers, the antennas and associated equipment
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Cell splitting | Cell splitting - The process of converting a single cell to multiple cells by sectorising the antennas in the cell site or constructing additional cells within a cell site
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CELP | CELP - Code Excited Linear Prediction; an analogue to digital voice coding scheme, there are a number of variants used in cellular systems
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CEPT | CEPT - Conference of European Posts and Telecommunications. A organisation of national posts, telegraphs and telephone administrations. Until 1988, when this work was take over by ETSI, the main European body for telecommunications standardisation. CEPT established the original GSM standardisation group
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CF | CF - Call Forwarding
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CI | CI - Carrier to Interference ratio
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CIBER | CIBER - Cellular Intercarrier Billing Exchange Roamer Record
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CID | CID - Caller Identification
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Circuit switching | Circuit switching - A method used in telecommunications where a temporary dedicated circuit of constant bandwidth is established between two distant endpoints in a network. Mainly used for voice traffic; the opposite of packet switching
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CLI | CLI - See Caller ID
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CLID | CLID - Calling Line Identification
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CLIP | CLIP - Calling Line Identification Presentation
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CLIR | CLIR - Calling Line Identification Restriction
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CLR | CLR - Clear; the key on a cellular phone which is pressed to remove information from the display
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CM | CM - Connection Management; is used to set up, maintain and take down call connections
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CMOS | CMOS - Complementary Metal Oxide Substrate
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Codec | Codec - A word formed by combining coder and decoder the codec is a device which encodes and decodes signals. The voice codec in a cellular network converts voice signals into and back from bit strings. In GSM networks, in addition to the standard voice codec, it is possible to implement Half Rate (HR) codecs and Enhanced Full Rate (EFR) codecs
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Control signal | Control signal - A signal sent to a cellular phone from a base station or vice versa which carries information essential to the call but not including the audio portion of a conversation
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CPE | CPE - Customer Premises Equipment; all the equipment on the end user’s side of the network interface
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CPU | CPU - Central Processing Unit
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CRC | CRC - Cyclic Redundancy Check
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CRM | CRM - Customer Relationship Management
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CSE | CSE - CAMEL Service Environment
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CSS | CSS - Customer Support System
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CT | CT - Cordless Telephony
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CT0 | CT0 - Zero generation cordless telephony; the earliest domestic cordless phones which used analogue technology and which had severe limitations in terms of range and security
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CT1 | CT1 - First generation cordless telephony; Improved analogue phones with greater range and security; a number of European nations produced CT1 standards
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CT2 | CT2 - Second generation cordless telephony; Using digital technology CT2 phones offered greater range, improved security and a wide range of new functionalities. Used in both domestic and cordless PABX deployments, CT2 was standardised as an interim ETS but was overwhelmed by DECT
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CT2-CAI | CT2-CAI - Second generation cordless telephony-common air interface
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CTA | CTA - Cordless Terminal Adaptor; a DECT term
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CTM | CTM - Cordless Terminal Mobility
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CTR | CTR - Common Technical Regulation; part of the ETSI standardisation process
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CUG | CUG - Closed User Group
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