FaxBack NET SatisFAXtion 8.7 (Including R3) - Manual - Manual (Page 237)

4 – Appendices NET SatisFAXtion 8.7 Manual 237
4.3
Glossary
1D: A synonym for the MH algorithm.
2D: A synonym for the MR algorithm.
CSID Called Subscriber Identifier:
ECM Error Correction Mode: Allows the receiving fax machine to request re-
transmission of corrupt parts of the fax image. Not all fax machines support
ECM.
FoIP Fax over Internet Protocol:
G.711 µ-law: Audio compression algorithm designed for encoding human
speech.
G.729: Audio compression algorithm designed for encoding human speech at
low bit rates.
IP Internet Protocol: Standard protocol for most data networks.
JBIG Joint Bi-Level Image Experts Group: An advanced fax image compression
algorithm. Many fax machines do not support this standard, but it provides sig-
nificantly better compression than MH, MR and MMR.
MH Modified Huffman: The most basic fax image compression algorithm.
MMR Modified Modified Read: A slightly improved version of MR designed for
use with low-line-noise digital telephony connections.
MR Modified Read: An improved version of MH fax image compression.
RTP Real-time Transfer Protocol: Protocol for transmitting the audio portion of
a VoIP call over IP networks. Codecs used are typically G.711 µ-law or G.729.
SIP Session Initiation Protocol: Standard VoIP protocol for placing and receiv-
ing calls. SIP controls call setup and takedown as well as negotiating the audio
(RTP) channel or fax (T.38) channel.
T.30: The most fundamental ITU-T standard for fax.
T.38: The ITU-T standard for fax over IP networks.
T.4: ITU-T “Group 3” fax compression standard using the MH algorithm.
T.6: ITU-T “Group 4” fax compression standard using the MMR algorithm.
V.21: Low-speed (300 bit/s) “handshaking” protocol. Used for initial fax nego-
tiation and inter-page signaling.
V.34: High-speed fax transmission protocol allowing transmission at speeds up
to 33,600 bit/s.
VoIP Voice over Internet Protocol: