NYSE: IDT
Products

Discover how our products can revolutionize the way you communicate and collaborate.

Voice

Explore our advanced voice solutions designed to optimize your communication workflows.

Diverse range of DID number solutions designed to enhance your communication capabilities.

Experience unparalleled communication efficiency with our advanced SIP Trunking Solutions.

Cutting-edge technology to proactively detect and neutralize spam flags on your DID Numbers.

Messaging

Wherever your audience is, our platform ensures seamless messaging across diverse channels.

Build customer journeys by fostering interactive conversations, all within the framework of your app.ย 

Connect with your audience in a simple and effective way through our cutting-edge SMS platform.ย 

BYOC

Harness the power of IDT as your chosen carrier while leveraging your platform’s advanced features and services.

Integrate Twilio with our robust carrier routing platform to achieve unparalleled Voice termination system.

Experience reliable and high-quality communication services while leveraging the advanced capabilities of Genesys.ย 

Integrate IDT with the collaborative strength of MS Teams, unlocking efficient and feature-rich communication.ย 

Experience the power of our carrier network seamlessly connected to Plivo through our cutting-edge BYOC solution.ย 

Tools

Experience the power of our online voice tools, designed to simplify communication management.ย 

Ensure the authenticity and integrity of outbound calls with our STIR/SHAKEN Verification Check tool.ย 

User-friendly tool to verify the reputation of your business number, ensuring that it remains trusted.ย 

Compare and gain insights into outbound call expenses, optimize budget, and make informed decisions.ย 

Easily estimate and compare the costs associated with different DID numbers providers.ย 

Compare inbound VoIP rates among top CPaaS providers and optimize your inbound call costs.ย 

Generate custom SMS templates.ย 

Learn

Empower yourself with the resources you need to thrive in the dynamic landscape of communication.

Articles covering a wide range of topics.

Get answers to common queries.

Find instructions to make the most of our products.

Discover telecom insights and trends.

Find definitions of popular telecom terms.

Explore how our solutions have helped businesses.

Latest telecom trends, innovations, and market insights.

Company

A global telecom partner built to meet your needs.ย 

Discover the story behind our commitment to delivering innovative solutions to connect people and businesses worldwide.ย 

Learn about our robust network infrastructure that spans across the globe, ensuring reliable and secure connectivity.ย 

Got a question, feedback, or need assistance? Our dedicated team is here to help!

Find partners or sign up for partnership programs.

NYSE: IDT
LEARN

Audio encoding

In this article

Audio encoding, also known as voice encoding or codec (compression/decompression), is the process of converting an analog audio signal (your voice) into a digital format that can be transmitted over an IP network, such as the internet. Similarly, at the receiving end, the digital audio data is decoded back into an analog signal for playback through speakers or headphones. Audio encoding is a crucial component of VoIP technology, as it affects the quality of voice calls and the efficiency of data transmission.

When it comes to SIP (Session Initiation Protocol) for VoIP (Voice over Internet Protocol) communications, several audio codecs (compression/decompression algorithms) are commonly used and widely compatible across various SIP devices and platforms. These codecs ensure interoperability and facilitate efficient voice communication over IP networks. Here are some of the most commonly supported audio codecs in SIP:

G.711 (u-law and a-law)

G.711 is one of the most widely supported codecs in SIP. It offers high-quality, uncompressed audio but consumes a relatively large amount of bandwidth (typically 64 kbps per voice channel).

u-law is commonly used in North America, while a-law is prevalent in Europe and other regions.

G.729

G.729 is a popular codec known for its good voice quality while being more bandwidth-efficient compared to G.711. It typically consumes 8 kbps per voice channel.

G.729 is often favored in situations where bandwidth is limited.

Opus

Opus is a versatile and adaptive codec that offers excellent voice quality across a wide range of bitrates. It can adapt to varying network conditions, making it suitable for a variety of SIP implementations.

Opus is increasingly supported in modern SIP applications.

G.723.1

G.723.1 is another codec that offers good voice quality while being bandwidth-efficient. It typically consumes 5.3 kbps per voice channel.

It’s suitable for scenarios with limited bandwidth.

G.726

G.726 provides several bit rate options (16 kbps, 24 kbps, 32 kbps, and 40 kbps) to balance voice quality and bandwidth consumption.

It’s commonly supported in SIP systems.

iLBC (Internet Low Bit Rate Codec)

iLBC is designed for VoIP and videoconferencing applications, offering good voice quality with moderate bandwidth requirements.

It’s often used in SIP-based communication platforms.

AMR (Adaptive Multi-Rate)

AMR is commonly used in mobile VoIP applications and supports various bitrates, adapting to different network conditions.

It’s compatible with many SIP clients on mobile devices.

Speex

Speex is an open-source codec optimized for low-bitrate voice encoding. It’s suitable for applications where bandwidth conservation is critical.

Speex support can be found in some SIP implementations.

The choice of codec in SIP communications often depends on factors like available bandwidth, desired call quality, and compatibility with SIP equipment and services. Many SIP devices and platforms offer support for multiple codecs, allowing for negotiation between endpoints to find the best codec based on network conditions and quality requirements.

Share this article

Meet our wholesale voice routing

Fulfill all your voice calling needs with our category leading wholesale A-Z Voice Termination.
Try IDT Express for a $25 Credit

Get $25 Free Trial Credit

You could be interested in

Learn

Facial Recognition

Facial recognition is the power of AI which allows technology providers to authenticate end-users by...
Learn

Early Media

Early Media is a feature flag that enables the media to flow before the call...
Learn

Fallback option

Fallback options can be defined as a backup option reverted to when a primary option...