An audio codec that provides 4-KHz speech bandwidth switch able at 40,
32, or or 24 kbps.
Both G.729 (compression at 8 kbps) and G.723 (compression to 5.3 kbps
and 6.3 kbps)
have been defined as baseline voice compression coders to be used for
calls over an H.323 connection. Although the IMTC selected G.723, and
recommended G.729 for audio-only calls, both coders have the potential
widespread deployment by VoIP vendors, including those developing PC
Coder/decoder. A device that converts (codes) analog voice signals into
for transmission and decodes them on reception.
H.323 is an International Telecommunications Union (ITU) standard for
communications (voice, video, and data) over connectionless networks
that do not
provide a guaranteed quality of service, such as IP-based
networks and the Internet.
It provides for
call control, multimedia management, and bandwidth management for
and multipoint conferences. H.323 mandates support for standard audio
codecs and supports data sharing via the T.120 standard. The H.323
standard is network,
platform, and application independent, allowing any H.323 compliant
interoperate with any other.
Internet Protocol. Part of the TCP/IP family of protocols IP is the IETF
protocol used in the Internet. It describes software that tracks the
of nodes, routes data from its source to its destination, and recognizes
Public Switched Telephone Network. The telephone network connecting all
Quality of Service. This measure can be either a network-oriented
such as bit-error rate or QoS can be user-oriented, with measures
oriented toward the perceived quality received by the end user for
video or multimedia applications.
Voice over Internet Protocol. The transport of a real time
phone call over packet switching IP networks.