December 05, 2005
VoIP terminology
Codec: It is a compression/decompression algorithm which is used for IP telephony as well as other streaming media.
G.723.1: It’s a codec developed by the ITU-T and has two associated bit rates; 5.3Kbps and 6.3Kbps. It is mainly used in IP telephony systems.
G.729: It is a codec developed by ITU-T and has a bit rate of 8Kbps.
Gateway: It is network which converts voice and fax transmissions between PSTN and IP networks in real time.
H.323: It is a collection of standards by ITU-T. The standards define endpoints, gateways, etc that are used in VoIP calls. The H.323 standards are older than SIP.
IP-PBX: An IP-based phone system is configured and has call control provided by an IP-PBX server.
IP Phone or Handset: It is used for connecting to the IP PBX over an IP LAN.
MPLS: It stands for Multiprotocol label switching and is a set of QoS labeling standards released by the IETF. It helps ISPs to prioritize the different data streams.
PBX trunk: It is a path of communications shared by both the public network and the PBX at the customer end.
PSTN: It stands for Public switched telephone network and is also referred to as plain old telephone service POTS.
Q. Sig: Q Signaling is a signaling standard that is used for PBX interoperability in the US and Europe.
RTP: It stands for Real-Time Transport Protocol; it is the Internet protocol that is used by IP telephony systems to stream voice and video.
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