Almost everyone has heard abbreviation SIP. But not everyone understands what it is and how SIP-telephony differs from regular telephone communication. We continue the cycle of introductory articles about analytics and virtual automatic telephone exchanges. Moreover, today’s topic of our article is SIP-telephony for dummies.
What distinguishes SIP-telephony from IP and VoIP
If you’ve ever read about a virtual PBX, you’ve probably come across these terms. So first, we’ll figure it out – what is the difference between SIP, IP-telephony, and VoIP. This will help you not to get confused by the terminology and immediately understand how everything is arranged.
Let’s start with the most extensive notion – IP (Internet Protocol). We can say that this is the “beginning of all beginnings” since it is the IP protocol that has connected all computer networks of the world to the global Internet network. That’s why each computer has its own unique IP-address, which is needed for data exchange.
To transfer audio data over the network, there is a technology called VoIP (Voice over IP). Thanks to it, we can exchange any data where there is a voice – to call through the Internet, to broadcast webinars or to watch video from the CCTV cameras with sound.
IP-telephony (sip trunking vs VoIP) is a common name for telephone communication over the Internet. This is part of VoIP, but this includes only calls and video calls over the network and nothing more. As the name implies, the connection is due to the same IP protocol.
The Even narrower concept of SIP-telephony. If IP-telephony is the name of the technology as a whole, then SIP is just one of its varieties, the communication protocol. If you compare, they also relate to each other, like a laptop and ASUS.
About SIP, we’ll talk later, but for now, let’s sum up:
SIP-telephony: what it is and how it works
So, SIP (Session Initiation Protocol) – the protocol for data transfer. One can comment can be compared with a language that helps customers understand each other and exchange data without errors. It is used for a variety of purposes – for IP telephony, video and audio conferences and even online games. Simply put, it works in a “client-server” scheme, constantly alternating requests and answers.
It so happened that often the word SIP is sometimes called the technology of calls through the Internet as a whole. Then the question arises: SIP and IP-telephony – what’s the difference? The difference is that SIP-telephony is a connection via the Internet only with the help of this particular protocol. For example, it uses Skype.
There are other protocols for IP-telephony. But in our time SIP is a universal standard for data exchange over the network. Experts consider it to be the most promising, and it is most often used. SIP-telephony is available where there is the Internet with a speed of at least 64 Kbps. That is, almost everywhere.
IP-telephony allows you to assign a number not to the location, but to a specific user, and this opens up wide opportunities, for example, for analytics. After all, you can learn much more about the client. In particular, this technology underlies call tracking.
How to make and receive calls using SIP:
- Using a computer or laptop, if you install a special program (SIP client) on it and equip it with a headset and a microphone;
- Via WI-FI or 3g / 4g using SIP-programs for tablets and mobile phones;
- Using a special fixed SIP-phone, which is included in the router;
- Connect a regular phone to the VoIP gateway, and the gateway itself to the router.
How SIP Telephony Works
Consider an example where a person calls from a computer on which a SIP client is installed to a company that uses SIP telephony:
During a call, a special program (codec) compresses the client’s voice into a digital signal. This speeds up communication and reduces the load on the network.
The signal is transmitted to the device that the company uses (computer, SIP phone, etc.).
Two devices find each other by an IP address and start a session over the SIP protocol.
The signal is again converted to analog, and the manager receiving the call hears the usual voice of the client.
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