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") ![](/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](/en/request-information "Write to us") ### TC systems [IP telephone systems](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/tc-systems#section-3) [Cloud telephone systems](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/tc-systems#section-4) [Choosing the right TC system provider](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/tc-systems#section-5) Telecommunications (TC) systems are switching systems that connect several devices, such as phones, fax machines or answering machines, to each other and to the public telephone network. They are also known as telephone systems, [private branch exchanges (PBX)](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/private-branch-exchange-pbx) or switchboards. With TC systems, users can make internal calls between connected phones – or extensions – free of charge, or switch to the public telephone network for chargeable outbound calls. Depending on the total number of trunk lines available for external calls, several outbound calls are possible from different extensions at the same time. Since the connected devices share the available trunk lines, a telecommunications system allows organisations to use their paid-for phone lines more efficiently. Depending on the system and its configuration, incoming calls can be forwarded automatically to the appropriate extension using a direct dial number,or transferred manually via an operator console. ### IP telephone systems In line with the trend for digitalisation, like many other originally analogue systems, telecommunications systems have evolved into fully digital systems, so-called [IP telephone systems](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/internet-telephony). These systems use [Voice over IP](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) (VoIP) technology and provide both analogue connector ports and digital (IP) ports for a wide range of devices. Devices are connected using a cable or wirelessly via [DECT](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/dect) or WiFi. With IP telephone systems, voice and data merge – along with their related applications, paving the way for new functionality. ### Cloud telephone systems Cloud telephone systems are modern **IP telephony systems** that are hosted in the cloud by a third-party provider. One example is [**Cloudya**](/en/products/cloudya)[, the cloud telephone system from NFON](/en/products/cloudya). The cloud approach means that businesses no longer have to install and maintain on-premises switching hardware: To use cloud telephony, all they need is an Internet connection with sufficient bandwidth. Theoretically, the maximum number of simultaneous phone calls is only limited by the bandwidth of the Internet connection. Users simply access and configure the cloud telephone system and its services from a web browser. One significant advantage of cloud systems is their capacity for flexible expansion. Connecting additional offices, users or extensions is usually a purely software-based process, with no need for implementing any additional hardware. Cloud telephone systems also bring invaluable benefits for businesses with a distributed, remote workforce, for example, where a number of employees work from home. They allow users to access all telephony features from virtually anywhere via a smartphone app, their tablet or laptop. Each user is available under their extension number at any time and on any device. New users and extensions can be added quickly and easily. All of this allows for more flexible mobile working. ### Choosing the right TC system provider Organisations planning to switch to cloud telephony should consider the following criteria when selecting the right TC system provider: 1. **Flexibility** – a commercial model that enables seamless and rapid scaling 2. **Speed** – a real cloud solution can be implemented in a very short time 3. **Bandwidth** usage – choose a solution that needs limited [bandwidth](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/bandwidth) to avoid the company network becoming overloaded and to maintain the best call quality. If necessary, consider using a separate Internet connection for IP telephony. Nconnect Data is a solution from NFON that provides high-performance Internet access and supports Cloudya’s functionality. 4. **Availabilit**y – does the provider operate in multiple countries and offer local phone numbers? How reliable is the international service. ### Related Articles ### Answering machine [Answering machine](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/answering-machine) ### Voice over Internet Protocol (VoIP) PSTN stands for Public Switched Telephone Network and is generally known as the traditional phone network. It has been connecting people since the late 19th century, at first over copper telephone lines and later using fibre optic cables, satellites, and undersea cables. All of these are interconnected by switching centres which establish a dedicated connection – or circuit – between callers. Voice signals can then travel over this circuit. When the caller speaks into his handset, the caller’s phone translates the sound waves into electrical signals. These are transmitted over the PSTN (converted to optical signals for part of the way, so they can travel via fibre optic cables), and the phone at the other end of the line then translates the received signals back into sound. The arrival of **Voice over IP (VoIP)** technology – essentially, transmitting voice calls over the Internet rather than the PSTN – challenged traditional telephony and fundamentally changed how people communicate. 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