FaxBack NET SatisFAXtion 9.0 - Fax Server Manual - Manual (Page 203)

MMR Modified Modified Read: A slightly improved version of MR designed for use with
low­line­noise digital telephony connections.
MR Modified Read: An improved version of MH fax image compression.
RTP Real­time Transfer Protocol: Protocol for transmitting the audio portion of a VoIP call over IP
networks. Codecs used are typically G.711 μ­law or G.729.
SIP Session Initiation Protocol: Standard VoIP protocol for placing and receiving 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 ITU­T standard for fax.
T.38: The ITU­T standard for fax over IP networks.
T.4: ITU­T “Group 3” fax compression standard using the MH algorithm.
T.6: ITU­T “Group 4” fax compression standard using the MMR algorithm.
V.21: Low­speed (300 bit/s) “handshaking” protocol. Used for initial fax negotiation and inter­page
signaling.
V.34: High­speed fax transmission protocol allowing transmission at speeds up to 33,600 bit/s.
VoIP Voice over Internet Protocol.
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