Multitech 810-FX Fax Machine User Manual

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 Chapter4–ConfiguringYourMultiVOIP

MultiVOIP®Voice/FaxoverIPGateways 41

Voice/FaxParameterDefinitions(continued)

CoderParameters

Coder Manualor

Automatic

Determineswhetherselectionofcoderismanualorautomatic.When

Automaticisselected,thelocalandremotevoicechannelsnegotiate

thevoicecodertobeusedbyselectingthehighestbandwidthcoder

supportedbybothsideswithoutexceedingtheMaxBandwidth

setting.G.723,G.729,orG.711are

negotiated.

SelectedCoder

(SSmodelsonly)

G.711a/ulaw64kbps;

G.726,@16/24/32/40kbps;

G.727,@ninebpsrates;

G.723.1@5.3kbps,6.3kbps;

G.729,8kbps;

NetCoder@

6.4,7.2,8,8.8,9.6kbps

Selectfromarangeofcoderswithspecificbandwidths.Thehigherthe

bpsrate,themorebandwidthisused.Thechannelthatyouarecalling

musthavethesamevoicecoderselected.

Default=G.723.1@6.3kbps,asrequiredforH.323.Here64Kofdigital

voiceiscompressedto6.3K,allowingseveralsimultaneous

conversationsoverthesamebandwidththatwouldotherwisecarry

onlyone.

TomakeselectionsfromtheSelectedCoderdrop‐downlist,the

Manualoptionmustbeenabled.

SelectedCoder

G.711,G.729

‐or‐

G.729,G.711

CoderPriorityhastwooptions(G.711,G.729orG.729,G711)onthe

SelectedCoderlistingoftheCodergroupontheVoice/Faxwindow.If

G.711isthehigherpriority,thatis,G.711ispreferredtoG729onthe

sendingside,thenG.711,G.729option

isselected.Similarly,ifG.729

hasthehigherpriority,thenG.729,G.711optionisselected.

ItisusedwheneverauserwantstoadvertisebothG.711andG.729

coderswithhigherpreferencetoaparticularcoder.

Itisusefulwhenthecallsaremadefromaparticularchannelonthe

VOIPtotwodifferentdestinationswhereonesupportsG.711andthe

othersupportsG.729.

Maxbandwidth

(coder)

11–128kbps



Thisdrop‐downlistenablesyoutoselectthemaximumbandwidth

allowedforthischannel.TheMaxBandwidthdrop‐downlistisenabled

onlyiftheCoderissettoAutomatic.

Ifcoderistobeselectedautomatically(“Auto”setting),thenentera

valueformaximumbandwidth.

AdvancedFeatures

Silence

Compression

Y/N Determineswhethersilencecompressionisenabled(checked)forthis

voicechannel.

WithSilenceCompressionenabled,theMultiVOIPdoesnottransmit

voicepacketswhensilenceisdetected,therebyreducingtheamount

ofnetworkbandwidththatisbeingusedbythevoicechannel(default

=on).

EchoCancellation Y/N Determineswhetherechocancellationisenabled(checked)forthis

voicechannel.

EchoCancellationremovesechoandimprovessoundquality(default=

on).

ForwardError

Correction

Y/N Determineswhetherforwarderrorcorrectionisenabled(checked)for

thisvoicechannel.

ForwardErrorCorrectionenablessomeofthevoicepacketsthatwere

corruptedorlosttoberecovered.FECaddsanadditional50%

overheadtothetotalnetworkbandwidthconsumedbythevoice

channel(default

=Off).

Tableiscontinuedonnextpage…

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Multitech 810-FX Fax Machine User Manual