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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") ### Dedicated line [What are the most common use cases for dedicated lines?](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dedicated-line#section-3) [Does Voice-over-IP (VoIP) use dedicated lines?](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/dedicated-line#section-4) # Dedicated line **What is a dedicated line?** The term dedicated line can be traced back to the origins of the telephone call. In its simplest terms it means a permanent connection between two participants. In the early days, this really meant an actual phone cable between two callers. The opposite to a dedicated line is a dial-up line. A dial-up line is, by definition, temporary. That means it is set up for the duration of the call and is therefore not permanently available. Nowadays, dedicated line is used to describe any private network connection. With modern networks, cables may be shared, but dedicated lines can still be created to provide secure, permanently available connections between locations or users. Dedicated lines are also sometimes referred to as leased lines, private circuits or data lines. Dedicated lines are often considered more secure as they are not connected to the public internet. ### Standleitung ![](https://a.storyblok.com/f/290788/014bdf5f95/standleitung.jpg) ### What are the most common use cases for dedicated lines? Dedicated lines are useful for a number of use cases. These include: **Home networking applications** Dedicated lines in home networks may include a PC or laptop connected directly to a data storage device with a high speed cable. In this scenario, data transfer between the two devices takes place offline, which makes it very secure and reliable. Another example of a dedicated line in a home network application would be a thunderbolt cable which is used to transfer files between two Apple Macbooks. Again, the data transfer happens offline, making it totally secure. **Corporate branch networks**  Dedicated lines can be used in a local area network (LAN) to connect two branches of the same company. The use of a dedicated line can help to maximise security for data transfers between the branches. In the same way, companies can use dedicated lines to connect specialist facilities, such as manufacturing sites, to their headquarters or other administrative sites, for example. **University networks** Many universities use dedicated lines to connect multiple buildings on campus, for example. Additionally, universities often operate a private internal network based on dedicated lines, giving students and faculty members access to secure services. **Data centre and cloud connectivity** Many organisations, including financial institutions, use multiple dedicated lines from different service providers to connect their internal systems with remote sites, such as data centres. This increases security by ensuring that sensitive data never touches the public internet. Additionally, it means that critical data and services remain available even if one dedicated line goes down. ### Does Voice-over-IP (VoIP) use dedicated lines? Yes, [VoIP](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) creates dedicated lines temporarily using [SIP trunking](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip-trunk) functionality. This sets up a secure connection between users on the internet so that packets of voice data can be delivered and a voice conversation can take place. To find out more about dedicated lines and secure VoIP connections, please consult the following articles from NFON: ### Related Articles ### Telephone Connection A telephone connection is a standard part of telecommunications. In the following, we will first take a closer look at the term. [Telephone Connection](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/telephone-connection) ### 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. [Voice over Internet Protocol (VoIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) ### Session Initiation Protocol (SIP) The acronym SIP stands for Session Initiation Protocol and refers to a TCP/IP-based network protocol which can be used to establish and control communication connections of several subscribers. SIP is often used in [Voice-over-IP telephony](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) to establish the connection for telephone calls. The key features of Session Initiation Protocol are specified in RFC3261. Since Session Initiation Protocol is an open standard, the protocol is widely used worldwide. Almost all IP-based [telephone systems](https://web-production.nfon.com/gb/products/cloudya) have SIP. 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