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[Write to us](/gb/request-information "Write to us") # Everything you want to know about Cloud Telephony ## Cloud Telephone System [a/b Interface](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/a-b-interface) [Asymmetric Digital Subscriber Line (ADSL)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/adsl) [Broadband Internet Connection](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/broadband-internet-connection) [Busy Lamp Field (BLF)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/busy-lamp-field-blf) [Carrier Point-to-Point (CP2P) Connection](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/cp2p) [Cloud](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/cloud) [Direct Data Link (DDL)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ddl) [Download speed](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/download-speed) [Dynamic Circuit Network (DCN)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dcn) [eFax: Send faxes over the internet](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/efax) [Gateways](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/gateways) [HD telephony](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/hd-telephony) [Internet Connection](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/internet-connection) [Internet telephony](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/internet-telephony) [IP address](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ip-address) [IP DECT](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ip-dect) [IP Multimedia Subsystem (IMS)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ims) [IP phone](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ip-phone) [IP-Centrex](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ip-centrex) [Migration](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/migration) [National & international phone numbers](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/national-international-phone-numbers) [P2P (Point-to-Point Connection)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/p2p) [Quality of Service (QoS)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/qos) [Real-time Transport Protocol (RTP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/rtp) [Request for Comments (RFC)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/request-for-comments-rfc) [SDSL / SHDSL](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sdsl-shdsl) [Session Initiation Protocol (SIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip) [SIP-Trunk](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip-trunk) [Softphones](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/softphones) [Source based call forwarding](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/source-based-call-forwarding) [TCP/IP](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/tcp-ip) [Telecommuting](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telecommuting) [Telephony Application Programming Interface (TAPI)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/tapi) [Virtual fax machine](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/virtual-fax-machine) [Voice over Internet Protocol (VoIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) ## Call Management [Address Book](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/address-book) [Asynchronous Transfer Mode (ATM)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/atm) [Call blocking](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-blocking) [Call handling](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-handling) [Call history](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-history) [Call management](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-management) [Call pick up](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-pick-up) [Call profile](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-profile) [Call queueing](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-queueing) [Call routing](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-routing) [Call Waiting Function](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-waiting-function) [Callback](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/callback) [Calling Line Identification Presentation (CLIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/clip) [Calling Line Identification Restriction (CLIR)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/clir) [Completion of Calls to Busy Subscriber (CCBS)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ccbs) [Conference call](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/conference-call) [Conference function](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/conference-function) [Dial plan](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dial-plan) [Direct Calling](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/direct-calling) [Holding calls](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/holding-calls) [Interactive Voice Response (IVR)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ivr) [Music on hold](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/music-on-hold) [Simultaneous ring](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/simultaneous-ring) [Soundstation](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/soundstation) [Telephone number block](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-number-block) [Telephone operator workstation](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-operator-workstation) [Toggling](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/toggling) [Unified Messaging System](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/unified-messaging-system) [Voice encryption](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-encryption) [Voice portals](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-portals) [Voicemail](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voicemail) ## Features [Advanced Audio Distribution Profile (A2DP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/a2dp) [Answering machine](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/answering-machine) [AT commands](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/at-commands) [Audio compression](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/audio-compression) [CCNR](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ccnr) [Fallback](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/fallback) [Fax2Mail](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/fax2mail) [Intercom](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/intercom) [Key assignment](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/key-assignment) [Keypad expansion](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/keypad-expansion) [Multiphone function](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/multiphone-function) [Multiplex connections](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/multiplex-connections) [Plug & Play](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/plug-play) [Redial button](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/redial-button) [Software as a Service (SaaS)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/software-as-a-service) [Sound waves](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sound-waves) [Speed Dial Button](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/speed-dial-button) [Telephone number portability](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-number-portability) [TPS](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/tps) [Uninterruptible Power Supply](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/uninterruptible-power-supply) [Upload speed](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/upload-speed) [Wideband Audio](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/wideband-audio) ## Data Security [Advanced Encryption Standard (AES)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/aes) [Data encryption](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/data-encryption) [Firewall](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/firewall) [Firmware](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/firmware) [Key-length](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/key-length) [Servers](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/servers) [WPA2](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/wpa2) ## Customer Management [Agent](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/agent) [Call centre](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-centre) [Call Centre Monitoring](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/call-centre-monitoring) [Customer Relationship Management (CRM)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/customer-relationship-management) [Premium rate numbers](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/premium-rate-numbers) ## Telephone Systems [Analogue telephone lines](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/analogue-telephone-lines) [Dedicated line](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dedicated-line) [Hosted PBX](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/hosted-pbx) [Hybrid telephone system](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/hybrid-telephone-system) [Private Automatic Branch Exchange (PABX)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/pabx) [Private Branch Exchange (PBX)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/private-branch-exchange-pbx) [TC systems](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/tc-systems) [Telephone Connection](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-connection) [Telephone provider](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-provider) ## Wireless Communication [Bandwidth](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/bandwidth) [Bluetooth](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/bluetooth) [Cordless telephony](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/cordless-telephony) [DECT](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dect) [Multi Cell DECT](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/multi-cell-dect) [SBC Codec](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sbc-codec) [Single Cell DECT](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/single-cell-dect) ## Telecommunications Billing [Billing units](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/billing-units) [Cheap phone calls: 3 cost-efficient opportunities](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/cheap-phone-calls) [Flat rate](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/flat-rate) [Itemised billing](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/itemised-billing) ## Telecommunications Network [Fixed-line network](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/the-fixed-line-network) [Integrated Services Digital Network (ISDN)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/isdn) [ISDN private branch exchange line group](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/isdn-private-branch-exchange-line-group) [Mobile phone network](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/mobile-phone-network) [Primary Rate Interface (PRI)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/primary-rate-interface-pri) [Public Switched Telephone Network (PSTN)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/pstn) [S0 bus](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/s0-bus) [SP2P](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sp2p) [Telecommunication networks](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telecommunication-networks) [Virtual Private Network (VPN)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/virtual-private-network) [XCAPI](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/xcapi) ## 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