SIP and IP-telephony - what is the difference? - SMS-Man Blog
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SIP and IP-telephony – what is the difference?


Those who have at least once encountered a virtual PBX, understand what we are talking about. Others need to understand the terms sip and ip-telephony. What is the difference between them? Then it will become clear how everything works. The most common technology is IP-telephony. This protocol connected all the computer networks of the planet. That’s how the Internet appeared. That’s why all devices have a unique IP address. Voice over IP is a technology used to transmit audio information over a network. It allows you to make calls over the Internet, keep in touch during webinar broadcasts, etc. For newcomers sip sounds like a completely unfamiliar concept. However, it’s not all that complicated.  SIP ip-telephony is one of the protocols. Simply put, IP in this comparison is a laptop and SIP is Acer.

SIP-telephony: what it is and how it works

SIP is a communication tool that establishes a language between different devices for error-free communication. Some people mistakenly imagine it only with Internet calls (perhaps because sip with number substitution is one of the most popular variants of the protocol).

SIP-телефония: что это и как работает

In fact, its application is much wider. It can be used for IP-telephony, audio and video conferences, etc. Connecting an sip-phone allows you to create a “client-server” scheme. The system will work in request-response mode. This protocol is available if the Internet speed is 64 Kbps or higher.

What is good about SIP service with number swapping?

It allows you to make outgoing calls and receive them using a virtual PBX:

  • via PC or laptop (SIP-client required);
  • via WI-fi or 3g/4g with SIP programs installed on the mobile device;
  • By connecting sip-phone to the router;
  • By means of an telephone;
  • SIP IP-telephony

The essence of SIP-telephony?

A simple example is a call from a client on a computer, to a company that uses SIP with number substitution. First, the person’s voice is compressed into a digital signal by the codec. Then the signal is transmitted to the company. The devices “recognize” each other by the IP address. A sip communication session begins. Then the signal is converted back to voice.

Setting up a sip phone

Before installing an sip-phone, you must do the following steps. The first step is to choose a quality product. Reliability of communication should be in the first place. The service should have available numbers of a suitable operator and the ability to configure the service.

In addition, you need to be well prepared. You will need an Internet connection, a laptop, headphones and software to make calls. A useful bonus is a sip-format number. One question remains – how and who installs the sip-phone?

Two options are possible:

  • The company providing the virtual PBX service ;
  • Self-configuration according to the manufacturer’s instructions.

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