User manual

Release 2.0 Digium, Inc. Page 51
Appendix C: Glossary and Acronyms
G.711
The International Telecommunications Union recommendation for an
algorithm designed to transmit and receive µ-law PCM voice and A-law
at digital bit rate 64 Kbps. This algorithm is used for digital telephone sets
on digital PBX.
G.729
The International Telecommunications Union standard for voice
algorithm.
H.323
The International Telecommunications Union standard for multimedia
communications over packet-based networks.
IAX Inter-Asterisk eXchange
The protocol used by Asterisk. It is used to enable VoIP connections
between Asterisk servers, and between servers and clients that also use
the IAX protocol.
iLBC internet Low Bitrate Codec
A free speech codec used for voice over IP. It is designed for narrow band
speech with a payload bitrate of 13.33 kbps (frame length = 30ms) and
15.2 kbps (frame length = 20 ms).
ILEC incumbent local exchange carrier
The LECs that were the original carriers in the market prior to the entry of
competition and therefore have the dominant position in the market.