Audio encoding

home sitemap login →   

subscribe to press releases


Quick Search
protocol max price
call to
advanced search →

Voip News

WhatsApp Begins Voice Calling Feature
WhatsApp is a popular messaging service that many people use in lieu of SMS messaging. Recently, WhatsApp began gradually rolling out a new VoIP feature that will allow users in India to engage in voice…

Voxox Will Now Supply Cloud Phone Hosted VoIP
Every business owner is looking for ways to save money, time, and to increase the productivity of their business. Voxox, an internet phone service provider, is now offering a solution to this concern.…

Voip Press releases

4PSA Receives 2014 INTERNET TELEPHONY Product of the Year Award
Orlando, Florida - February 4, 2014 - 4PSA - a technology leader in cloud communications software, announced today that TMC, a global, integrated media company, has named VoipNow Cloud OnDemand as a recipient…

Popular Providers
by creation press releases

- Voicebuy Wholesale VoIP Provider
- Polycom Inc
- Huawei Technologies
- Super Technologies Inc.
- 4PSA

Audio encoding VoIP GlossaryAudio encoding

 

Audio encoding

The ITU has defined multiple audio codecs for use with H.323. All of them are also compatible with SIP, which is codec-agnostic.

G.711 is 3 kHz audio encoded at 64-kbps. G.711 is PCM audio, the format used for voice delivery over traditional telephone networks and exchanges.

G.722 is high-quality 7kHz audio in 48-, 56-, or 64-kbps streams. Two lower-quality, narrow-band revisions exist: G.722.1 encodes the audio at 24- or 32-kbps, and G.722.2 encodes at around 16kbps.

G.723.1 is used for compressing speech at very low bit rates: 5.3- and 6.3-kbps.

G.728 is 3.4kHz audio encoded at 16-kbps, but uses much smaller packet sizes (.625 millisecond, as compared to 37.5ms for G.723.1) to guarantee low delays.

G.729 is a newer voice codec using 8-kbps streams and 15ms packet sizes. There are two variations, G.729 and G.729A, that differ only in their mathematical implementation.

Speex is an open source speech codec. In contrast to the G-series codecs listed above, it is not protected by patents. It encodes at variable bitrates, from 2.15- to 44.2-kbps.

GSM6.10 is another open source codec, encoding at 13.3-kbps. At this time there is an unresolved patent dispute surrounding the codec, but is still supported by multiple software programs.

Back to VoIP Glossary →


Business VOIP Providers
  • Jive Communications

  • RingCentral VoIP

  • OnSIP

  • PGI



Residential VOIP Providers
  • VoIPo

  • ITP VoIP

  • Axvoice



Send SMS for Free →