SIP and IP-telephony - what is the difference? - Sms-man Blog

SIP and IP-telephony – what is the difference?


Those who have at least once encountered a virtual PBX, have an idea of the terms in question. Others need to immediately define for themselves the essence of sip and ip telephony, what the difference between them is, what VoIP is about, and then it will become clear how everything works. The essence of sip and ip-telephony, what the difference between them is, what VoIP is about, and then it will become how everything works.

The most widespread technology is IP-telephony. This protocol connected all 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 makes it possible to make calls over the Internet, keep in touch during webinar broadcasts, etc.

But SIP sounds like a completely unfamiliar concept for dummies. But everything is not so complicated.  SIP-telephony – one of the IP technologies, one of the protocols. In simple words, 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 incorrectly identify it only with Internet calls (perhaps because sip with number substitution is one of the most popular protocol options).

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, online games, etc. Connection of sip phone allows you to create a “client-server” scheme: the system will work in request-response mode. Such 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 ordinary telephone (it connects to the VoIP-gateway, and the latter to the router).
  • SIP IP-telephony

The essence of SIP-telephony?

A simple example is a call from a client on the computer (there is a SIP-client), to a company that uses SIP with number substitution. First, the person’s voice is compressed to a digital signal by the codec (communication is accelerated and the network load is reduced). Then the signal is transmitted to the firm: the devices “recognize” each other at the IP address. A communication session is initiated using the sip protocol. The signal is then converted back into voice.

Setting up a sip phone

Before the sip-phone will be set up, the following steps must be taken. 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 option of individual configuration of the service.

In addition, you need to “arm yourself” properly: a good Internet connection, a laptop or PC, headphones with a headset and a program for making calls. As a useful bonus – a sip-format number. There remains one question – how and who configures the sip-phone? SIP IP-telephony good works.

Two options are possible:

  • The company providing the virtual PBX service (if such is used);
  • Self-configuration according to the manufacturer’s instructions – if special software is used.
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