|
Voip News
General Telecom Announced Availability of Private Label Communications as a Service (CaaS) Solution
General Telecom, a premier provider of outsourced telecom solutions, has announced the availability of company’s Full Service VoIP Concierge Partner Program that represents a scalable, cost effective,… →
Matrix Announced Compliance of Its VoIP Gateways with Broadvox GO! SIP Trunking Services
Matrix Comsec, one of leading manufacturers of VoIP products, has officially announced that the company had tested its products with Broadvox GO! SIP trunking services, USA.
According to Matrix ComSec,… →
Voip Press releases
Tpad Predictive Diallers are Backed by SIP Technology
Tpad has combined two leading discoveries in the telecommunications industry, predictive Diallers and the SIP technology, in their full-featured predictive SIP dialler.
Tpad has recently announced the… →
Popular Providers
by creation press releases
|
 VoIP Glossary
| |
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 →
|
|
|
|
|
|
|
