• Comunicaciones Digitales
  • ·

  • Aug 13, 2026

What is SIP Trunking?

SIP trunks are essentially telephone lines that operate over the internet using the SIP protocol. A SIP trunk is a communication connection linked to the public telephone network to provide one or more bidirectional voice channels (for both incoming and outgoing calls); consequently, they can be associated with virtual DID numbers and connected to virtual PBXs, physical telephone systems, and call centers.

VoiceToPhone

What is SIP Trunking?

What is SIP Trunking?

SIP Trunking (Session Initiation Protocol Trunking) is a telephone line that works over the internet using the SIP protocol. Unlike traditional copper phone lines, a SIP Trunk requires no physical infrastructure — everything travels through your existing internet connection.

In simple terms, it is the technology that allows your business to make and receive phone calls using the same internet network you already have, eliminating the costs and limitations of analog systems.

How does it work?

When you make a call through a SIP Trunk, your voice is converted into digital data packets. These packets travel over the internet to the recipient, where they are converted back into audio. This happens in milliseconds, ensuring crystal-clear voice quality.

The process relies on two key protocols:

  • SIP (Session Initiation Protocol): manages the initiation, maintenance, and termination of each call.
  • RTP (Real-Time Transport Protocol): transports voice in real time once the connection is established.

Why choose SIP Trunking?

Companies that migrate to SIP Trunking report savings of up to 60% on their phone bill, while also gaining flexibility and scalability. You can add or reduce voice channels according to your business needs, without complex technical setups or costly installations.

It is also fully compatible with your virtual PBX or IP phone system, meaning you can modernize your communications without replacing your entire existing infrastructure.

SIP Trunk vs Analog Telephony

Here is a direct comparison between both technologies to help you make the best decision for your business:

Comparison

SIP Trunk vs Analog Telephony

Many companies compare both options to understand the impact on productivity, quality and costs.

SIP Trunk

Modern, flexible and scalable

  • Fast installation.
  • Works with internet connection.
  • Significant cost reduction.
  • Highly scalable (channel increase).
  • Integration with CRM, messaging and video.
Choose SIP Trunk

Analog Telephony

Traditional and limited

  • Installation delays.
  • Uses traditional telephone lines.
  • Limited scalability.
  • Expensive to scale and potentially obsolete.