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What Is SIP Telephony: A Beginner’s Guide

What Is SIP Telephony:
A Beginner’s Guide

An active internet user has likely used voice communication apps that operate over mobile internet via the SIP protocol. This protocol has a wide range of applications — from video conferencing to online gaming.

What Is SIP

SIP Telephony

SIP protocol

Session Initiation Protocol

SIP Software

SIP Providers

SIP Telephony

VoIP phone

MicroSIP

IP telephony supports only voice calls, while SIP allows the exchange of both audio and video data.
IP telephony assigns unique addresses to each network and transfers data using IP protocols. SIP, in contrast, supports multiple technologies for multimedia communication.

Main Differences

This protocol connects all devices into a global network. Each user is assigned a unique IP address for data exchange.

IP (Internet Protocol)

SIP vs. IP Telephony

Virtual Number — a mobile number without a physical PBX, used for call forwarding.
Direct Number — used for local or long-distance calling. Unlike traditional PBX calls, these provide superior signal quality.
Toll-Free Number — numbers like 8-800 (similar to 1-800 in the U.S.) are typically used by customer support centers.

Standard Telephone Numbers

Now that we’ve introduced SIP telephony, let’s take a closer look at how it works. The process of voice data exchange follows this sequence:

The human voice signal is converted into digital form using special codecs. This reduces network load and ensures faster communication.
The digital signal is transmitted to the recipient’s device.
A connection between devices is established via IP addresses, and a SIP session is initiated.
On the receiving end, the signal is converted back to analog form, allowing the person to hear a natural human voice.

SIP Telephony Technology

SIP telephony enables devices to establish a proper connection for data exchange through the chain: client → server → client. This ensures smoother device interaction and high-quality communication based on a question-and-response principle.

SIP (Session Initiation Protocol)

Have you ever used SIP telephony?

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Integration with callback widgets can double conversion rates from website visitors to phone calls.

6. Callback Widget Support

Unlike analog connections, SIP provides better protection against external interception.

5. Enhanced Security

Integration with analytics and CRM systems enables businesses to monitor operator efficiency, track marketing channels, and evaluate customer service quality.

4. Seamless CRM Integration

SIP telephony uses standard rates, allowing large companies with global offices to save on roaming charges.

3. Basic Rate Plans

All you need is a laptop or smartphone with an internet connection — no complex installation required.

2. Easy Setup and Use

Connecting SIP telephony is far cheaper than installing traditional PBX systems.

1. Cost Efficiency

Advantages of SIP Telephony

An advanced SIP messenger with built-in encryption, ensuring your call recordings remain private.
Includes a contact book and text chat for convenient customer communication. User-friendly and intuitive.

Zoiper

A lightweight softphone for Windows with video call support.
It weighs only 2.5 MB and uses 5–12 MB of RAM. Supports H.264 and H.263+ video codecs. Simple interface — perfect for users who prefer straightforward functionality.

MicroSIP

A robust SIP client compatible with Windows, macOS, and Linux.
Blink offers a free version for testing, supports unlimited accounts, HD video, and TLS encryption. Users can record and transfer voice files seamlessly.

Blink

Popular SIP Telephony Apps

Install a SIP client on your PC, laptop, or tablet. To host video conferences, connect a webcam, microphone, and speakers. Registration and initial configuration are required.