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[+498006366555](tel:+498006366555) ### Difference Between VoIP and SIP [What is VoIP?](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#072edfd09839) [What is SIP?](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#9b9bfb0c74b9) [What is SIP Trunking?](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#401550108cb4) [SIP vs. VoIP: Differences Explained](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#ae8b7b99c4b1) [Benefits at a Glance](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#52b04f51530a) [Recap: Key Terms to Remember](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#cb57b8bd90f9) [Which One Should You Choose](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voip-vs-sip#8fa8d0e257ac) ### What Is VoIP? **[VoIP (](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip/)*****[Voice over Internet Protocol](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip/)*****[)](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip/)** is a technology that enables you to make calls using the internet instead of traditional phone lines. It works by converting your voice into digital packets and sending them over your broadband connection. Everyday examples of VoIP technology: * Apps like Skype, WhatsApp, Zoom * Business cloud phone systems * Voicemail-to-email services **In short:** VoIP is about how your voice travels, not a single app or brand. ### What is SIP? **[SIP (](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip/)*****[Session Initiation Protocol](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip/)*****[)](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip/)** is not a phone service. It’s a set of rules that devices use to start, manage, and end communication sessions. **SIP can handle:** * Voice calls * Video meetings * Instant messaging * Multimedia conferencing So while VoIP carries your voice, SIP manages the entire communication “event.” ### What is SIP Trunking? **[SIP trunking](https://www.nfon.com/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip-trunk/)** is a method of using SIP to connect your PBX (private branch exchange) to the internet. Instead of physical lines, SIP trunks use your data connection to carry calls in and out. ### SIP vs. VoIP: Differences Explained Here’s a side-by-side look to make the difference between SIP and VoIP crystal clear: | | | | | --- | --- | --- | | **Feature / Aspect** | **VoIP Technology** | **SIP Protocol** | | *Definition* | Method for delivering voice over the internet | Rules for initiating and managing communication sessions | | *Scope* | Voice calls | Voice, video, messaging, multimedia | | *Dependency* | Can work with various protocols (incl. SIP) | Often used to enable VoIP but can do more | | *Common Use Case* | Internet-based calling | Unified communications, SIP trunking | | *Example Without Other* | VoIP without SIP: voice-only apps | SIP without VoIP: video conferencing setup | ### Benefits at a Glance **VoIP advantages:** * Lower call costs * Easy remote work setup * Simple to scale for small teams **SIP advantages:** * Supports voice, video, and messaging in one system * Integrates with existing PBX equipment via SIP trunking * Enables advanced features for unified communications ### Recap: Key Terms to Remember **VoIP:** Delivering voice calls over the internet. **SIP:** A protocol that initiates, manages, and ends communication sessions. **Difference between SIP and VoIP:** One is a communication method (VoIP), the other is a protocol that can power it (SIP). **SIP trunking vs. VoIP:** SIP trunking uses SIP to deliver VoIP and more. ### Which One Should You Choose? The decision comes down to needs, budget, and future plans: * Small teams / individuals → A basic VoIP setup without SIP might be enough. * Growing businesses → SIP offers flexibility and multimedia integration. * Enterprises → SIP trunking can lower telecom costs while keeping your hardware. If you’re looking for a trusted provider that delivers both VoIP technology and SIP-based solutions, **[NFON](https://www.nfon.com/en/)** offers cloud communication services tailored for businesses of all sizes.  With our Platform, you can benefit from cost-effective VoIP calling and **[Cloud Telephony](https://www.nfon.com/en/products/cloud-telephony/)**, advanced SIP trunking, and a scalable platform that grows with your organisation, all while ensuring high-quality, reliable connections. ## Frequently asked questions (FAQ) #### Is SIP the Same as VoIP? No, think of it like this: * VoIP is the “what” sending voice via the internet. * SIP is one possible “how” and it can handle more than voice. #### What is SIP trunking vs. VoIP? SIP trunking uses the SIP protocol to connect your business phone system to the internet, replacing traditional phone lines. VoIP is the broader concept of transmitting voice over the internet. SIP trunking is one way of delivering VoIP (and more) efficiently. ### Related Articles ### SIP-Trunk [SIP-Trunk](/en/get-started/cloud-telephony/lexicon/knowledge-base-detail/sip-trunk) ### 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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