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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") ### Voice encryption # Voice encryption The Secure Real Time Transport Protocol (SRTP) is based on the [Real Time Transport Protocol (RTP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/rtp). SRTP denotes a technical process for the encrypted transfer of multimedia data (for example speech) via existing networks. SRTP is used for example in internet telephony ([Voice over IP, in short: VoIP](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip)), in order to guarantee an eavesdrop-secure transfer of telephone data between multiple conversation participants. The NFON voice encryption system utilises the Transport Layer Security Standard (TLS) and the SRTP Standard. This is not only secure but also efficient. The encryption in [telephone systems](/gb/gb/products/cloudya) varies and can be integrated into the hardware or realised with the requisite software. ### 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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