Multitech 410 Fax Machine User Manual


 
Chapter4ConfiguringYourMultiVOIP
MultiVOIP®Voice/FaxoverIPGateways 41
Voice/FaxParameterDefinitions(continued)
CoderParameters
Coder Manualor
Automatic
Determineswhetherselectionofcoderismanualorautomatic.When
Automaticisselected,thelocalandremotevoicechannelsnegotiate
thevoicecodertobeusedbyselectingthehighestbandwidthcoder
supportedbybothsideswithoutexceedingtheMaxBandwidth
setting.G.723,G.729,orG.711are
negotiated.
SelectedCoder
(SSmodelsonly)
G.711a/ulaw64kbps;
G.726,@16/24/32/40kbps;
G.727,@ninebpsrates;
G.723.1@5.3kbps,6.3kbps;
G.729,8kbps;
NetCoder@
6.4,7.2,8,8.8,9.6kbps
Selectfromarangeofcoderswithspecificbandwidths.Thehigherthe
bpsrate,themorebandwidthisused.Thechannelthatyouarecalling
musthavethesamevoicecoderselected.
Default=G.723.1@6.3kbps,asrequiredforH.323.Here64Kofdigital
voiceiscompressedto6.3K,allowingseveralsimultaneous
conversationsoverthesamebandwidththatwouldotherwisecarry
onlyone.
TomakeselectionsfromtheSelectedCoderdropdownlist,the
Manualoptionmustbeenabled.
SelectedCoder
G.711,G.729
‐or‐
G.729,G.711
CoderPriorityhastwooptions(G.711,G.729orG.729,G711)onthe
SelectedCoderlistingoftheCodergroupontheVoice/Faxwindow.If
G.711isthehigherpriority,thatis,G.711ispreferredtoG729onthe
sendingside,thenG.711,G.729option
isselected.Similarly,ifG.729
hasthehigherpriority,thenG.729,G.711optionisselected.
ItisusedwheneverauserwantstoadvertisebothG.711andG.729
coderswithhigherpreferencetoaparticularcoder.
Itisusefulwhenthecallsaremadefromaparticularchannelonthe
VOIPtotwodifferentdestinationswhereonesupportsG.711andthe
othersupportsG.729.
Maxbandwidth
(coder)
11128kbps
Thisdropdownlistenablesyoutoselectthemaximumbandwidth
allowedforthischannel.TheMaxBandwidthdropdownlistisenabled
onlyiftheCoderissettoAutomatic.
Ifcoderistobeselectedautomatically(“Auto”setting),thenentera
valueformaximumbandwidth.
AdvancedFeatures
Silence
Compression
Y/N Determineswhethersilencecompressionisenabled(checked)forthis
voicechannel.
WithSilenceCompressionenabled,theMultiVOIPdoesnottransmit
voicepacketswhensilenceisdetected,therebyreducingtheamount
ofnetworkbandwidththatisbeingusedbythevoicechannel(default
=on).
EchoCancellation Y/N Determineswhetherechocancellationisenabled(checked)forthis
voicechannel.
EchoCancellationremovesechoandimprovessoundquality(default=
on).
ForwardError
Correction
Y/N Determineswhetherforwarderrorcorrectionisenabled(checked)for
thisvoicechannel.
ForwardErrorCorrectionenablessomeofthevoicepacketsthatwere
corruptedorlosttoberecovered.FECaddsanadditional50%
overheadtothetotalnetworkbandwidthconsumedbythevoice
channel(default
=Off).
Tableiscontinuedonnextpage…