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[+44 330 383 8000](tel:+443303838000 "+44 330 383 8000") ![](/images/getstarted-writetous-navbar-int_ZY7MOf.webp) ### Write to us Fill out our request form. Our experts will respond as soon as possible. [Write to us](/gb/request-information "Write to us") ### Migration [Migrating telephone services to Voice over IP (VoIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/migration#section-3) [Different migration strategies](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/migration#section-4) [Migration strategy requirements](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/migration#section-5) # Migration In information technology, the term migration refers to a process which converts data processing or information systems to different technology. The term porting is often used synonymously with migration. Since migration may affect a number of different components in an information technology system, the term migration may be used for the conversion as a whole as well as for individual components. The components affected may for example be software, data, hardware and applications. Migration often requires processing individual steps before the conversion including all components affected can be completed. ### Migrating telephone services to Voice over IP (VoIP) Service providers also refer to converting the telephone service to [Voice over IP (VoIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) due to disconnecting conventional telephone networks and implementing all-IP networks as migration. During this conversion, services to the end customer are to take place with as little impact on their equipment and with the least possible service interruption. To ensure that conventional analogue telephones, [ISDN](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/isdn) telephones or [telephone systems](/gb/en/products/cloudya) can still be used with a Voice-over-IP connection, the internet access routers also work as analogue to VoIP adapters and provide conventional telephone connections for the end customer’s devices. ### Different migration strategies Different strategies are used depending on the migration to be performed. To ensure that migration remains manageable the ‘Chicken Little’ strategy uses several small, incremental individual steps executed successively. On the other hand there is the ‘Big Bang’ strategy which executes the actual conversion in one single, final step. First the new system is set up and tested alongside the old system. If the new system works properly, the old system is deactivated and the new system put into service in a ‘Big Bang’. ### Migration strategy requirements A migration must meet many requirements to be considered successful. It is crucial to ensure that the service is not be interrupted during the conversion, or with minimal interruptions. The amount of changes should therefore be as little as possible to minimise the risk of service interruptions. However, changes also need to be extensive enough to ensure the new system meets all requirements. A successful migration satisfies both conflicting requirements. ### Related Articles ### Voice over Internet Protocol (VoIP) **What is VoIP?** The **Voice over Internet Protocol,** also called IP telephony, is a method of communication for making calls over a broadband Internet connection as an alternative to regular calls made over an analogue phone using the [PSTN](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/pstn). These VoIP calls can happen entirely over the Internet but where required, gateways also link to the PSTN. This means that VoIP users can still connect to anyone with a telephone number including local, mobile, and international numbers. VoIP services can be accessed from a computer with a so-called [softphone,](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/softphones) from an IP phone, from a smartphone or from a conventional landline phone that is connected to a VoIP adapter. 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