
MMR Modified Modified Read: A slightly improved version of MR designed for use with
lowlinenoisedigitaltelephonyconnections.
MRModifiedRead:AnimprovedversionofMHfaximagecompression.
RTP Realtime Transfer Protocol: Protocol for transmitting the audio portion of a VoIP call over IP
networks.CodecsusedaretypicallyG.711μlaworG.729.
SIP Session Initiation Protocol: Standard VoIP protocol for placing and receiving calls. SIP controls
callsetupandtakedownaswellasnegotiatingtheaudio(RTP)channelorfax(T.38)channel.
T.30:ThemostfundamentalITUTstandardforfax.
T.38:TheITUTstandardforfaxoverIPnetworks.
T.4:ITUT“Group3”faxcompressionstandardusingtheMHalgorithm.
T.6:ITUT“Group4”faxcompressionstandardusingtheMMRalgorithm.
V.21: Lowspeed (300 bit/s) “handshaking” protocol. Used for initial fax negotiation and interpage
signaling.
V.34:Highspeedfaxtransmissionprotocolallowingtransmissionatspeedsupto33,600bit/s.
VoIPVoiceoverInternetProtocol.
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