机载互联网协议语音（VoIP）话机英文翻译2026

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Number:CTSO-2C612

Dateofapproval:February26,2026

Approvedby:XuFeng

ChinaCivilAviationTechnicalStandardOrder

ThisChinaCivilAviationTechnicalStandardOrder(CTSO)isissuedaccordingtoPart37oftheChinaCivilAviationRegulations(CCAR-37).EachCTSOisacriterionwhichtheconcernedaeronauticalmaterials,partsorappliancesusedoncivilaircraftmustcomplywithwhenitispresentedforairworthinesscertification.

AirborneVoiceoverInternetProtocol(VoIP)Phones

1.Purpose.

ThisChinaCivilAviationTechnicalStandardOrder(CTSO)isformanufacturersseekingairborneVoiceoverInternetProtocol(VoIP)phoneCTSOauthorization(CTSOA).ThisCTSOspecifiestheminimumperformancestandardsthatairborneVoIPphoneequipmentmustmeetforapprovalandidentificationwiththeapplicableCTSOmarking.

2.Applicability.

ThisCTSOappliestoapplicationssubmittedafteritseffectivedate.

a.FromtheeffectivedateofthisCTSO,applicantsseekingCTSOAforairborneVoIPphoneequipmentonaircraftshallsubmitapplicationsinaccordancewiththisCTSO.

b.ForequipmentapprovedinaccordancewiththisCTSO,anymajordesignchangeshallrequirere-applicationforCTSOAinaccordancewiththerequirementsofArticle21.353ofCCAR-21-R5.

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3.Requirements

EquipmentmanufacturedaftertheeffectivedateofthisCTSOandintendedtobeidentifiedwiththeCTSOmarkingshallmeetthefollowingrequirements:

a.Functionality

TheseCTSO’sstandardsapplytoairborneVoIPphoneequipment,providingminimumperformancestandardsandtestprocedures.TheaudiosystemsanddevicesintegratedinairborneVoIPtelephoneequipment,includingaircraftmicrophones(excludingcarbongranulemicrophones),headsets,receiversandloudspeakers,shallmeettheminimumperformancestandardsspecifiedinAircraftAudioSystemsandDevices(CTSO-C139a).AirborneVoIPtelephonesincorporatingsuchaudiosystemsanddevicesshallbetestedinaccordancewiththerequirementsofAppendix1toensureproperfunctionality.

b.FailureConditionCategories

ThefailureconditioncategoriesapplicabletothisCTSOdependontheintendeduseoftheequipmentonaspecificaircraft.Thefailureconditioncategoriesforlossoffunctionandmalfunctionsshallbedocumentedduringequipmentdesign.

c.FunctionalQualification

Theequipmentperformanceshallbedemonstratedtomeettherequirementsinaccordancewiththeminimumperformancestandards

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specifiedinChapter5ofYD/T1686-2011“SpeechqualityandtransmissionperformancerequirementsandtestingmethodsforIPtelephonyequipment”.

d.EnvironmentalQualification

Theequipmentperformanceshallbedemonstratedtomeettherequirementsbyapplyingthestandardenvironmentalconditionsandtestproceduresapplicabletothisequipment,inaccordancewiththetestconditionsspecifiedinRTCA/DO-160GEnvironmentalConditionsandTestProceduresforAirborneEquipment.ApplicantsmayalsoadoptotherstandardenvironmentalconditionsandtestproceduresapplicabletoairborneVoIPphoneequipment,otherthanthosespecifiedinRTCA/DO-160G.

Note:Typically,RTCA/DO-160D(includingChange1andChange2,excludingChange3)orearlierversionsarenolongerapplicable.Ifsuchversionsareused,demonstrationshallbeconductedinaccordancewiththedeviationrequirementsinSection3.gofthisCTSO.

e.SoftwareQualification

Iftheequipmentincludessoftware,thesoftwareshallbedevelopedinaccordancewithRTCA/DO-178C“SoftwareConsiderationsinAirborneSystemsandEquipmentCertification”(December13,2011)oritslatestversion,includingreferencedsupplements(ifapplicable).

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f.ElectronicHardwareQualification

Iftheequipmentincludescomplexelectronichardware,itshallbedevelopedinaccordancewiththerequirementsofRTCA/DO-254“DesignAssuranceGuidanceforAirborneElectronicHardware”(April19,2000).ThehardwaredesignassurancelevelshallbeconsistentwiththefailureconditioncategoriesspecifiedinSection3.bofthisCTSO.Forhardwaredeterminedtobesimpleairborneelectronichardware,itmaybehandledinaccordancewithSection1.6ofRTCA/DO-254.

g.Deviations

ForusingalternativeorequivalentmeansofcompliancetothecriteriainthisCTSO,theapplicantmustshowthattheequipmentmaintainsanequivalentlevelofsafety.Applyforadeviationundertheprovisionof21.368(a)inCCAR-21-R5.

4.Marking.

a.Markatleastonemajorcomponentpermanentlyandlegiblywithalltheinformationof21.423(b)inCCAR-21-R5.Themarkingmustincludetheequipmentserialnumber.

b.Also,markthefollowingpermanentlyandlegibly,withatleastthemanufacturer’sname,subassemblypartnumber,andtheCTSOnumber:

(1)Eachcomponentthatiseasilyremovable(withouthandtools);and,

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(2)Eachsubassemblyofthearticlethatyoudeterminedmaybeinterchangeable.

c.Iftheequipmentincludessoftwareand/orairborneelectronichardware,thepartnumbermustindicatetheconfigurationofthesoftwareandairborneelectronichardware.Whenassigningpartnumbers,separatefieldsmaybeallocatedforsoftwareandairborneelectronichardwarewithinthepartnumber.

d.Electronicmarkingmaybeusedtoidentifysoftwareandairborneelectronichardware,thismarkingmaybewrittenintothehardwarecomponentviasoftwarewithoutbeingmarkedontheequipmentnameplate.Ifelectronicmarkingisused,itmustbeeasilyreadablewithouttheuseofspecialtoolsorequipment.

5.ApplicationDataRequirements.

Theapplicantmustfurnishtheresponsiblecertificationpersonnelwiththerelateddatatosupportdesignandproductionapproval.Theapplicationdataincludeastatementofconformanceasspecifiedinsection21.353(a)inCCAR-21-R5andonecopyeachofthefollowingtechnicaldata:

a.AManual(s)containingthefollowing:

(1)Operating(usage)instructionsandarticlelimitationssufficienttodescribetheequipment’soperationalcapability.

(2)Describeindetailanydeviations.

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(3)Installationproceduresandlimitationssufficienttoensurethatthecargorestraintstrapassembly,wheninstalledaccordingtotheinstallationoroperationalprocedures,stillmeetsthisCTSOrequirements.Limitationsmustidentifyanyuniqueaspectsoftheinstallation.Thelimitationsmustincludeanotewiththefollowingstatement:“ThisarticlemeetstheminimumperformanceandqualitycontrolstandardsrequiredbyaCTSO.Installationofthisarticleonanaircraftrequiresseparateapproval.”

(4)Forallsoftwareandairborneelectronichardwareconfigurations,including:

(i)Softwarepartnumber,includingrevisionanddesignassurancelevel;

(ii)Airborneelectronichardwarepartnumber,includingrevisionanddesignassurancelevel;

(iii)Functionaldescription.

(5)Summaryofenvironmentalqualificationtestconditionsforeachcomponentoftheequipment.Forexample,thetableformatinAppendixAofRTCA/DO-160G“EnvironmentalConditionsandTestProceduresforAirborneEquipment”maybeused.

(6)Schematicdiagrams,wiringdiagrams,andotherdocumentsnecessaryforequipmentinstallation.

(7)Listofreplaceablepartsfortheequipment(withpartnumbers

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indicated).Ifapplicable,includecross-referencestovendorpartnumbers.

b.Instructionscoveringperiodicmaintenance,calibration,andrepairtoensurethatcargorestraintstrapassembliescontinuetomeettheCTSOapproveddesign.Includerecommendedinspectionintervalsandservicelife,asappropriate.

c.Iftheequipmentincludessoftware,alsoprovide:softwarecertificationplan,softwareconfigurationindex,andsoftwareaccomplishmentsummary.

d.Iftheequipmentincludessimpleorcomplexelectronichardware,alsoprovide:hardwarecertificationplan,hardwareverificationplan,top-leveldrawings,andhardwareaccomplishmentsummary(orsimilardocuments,ifapplicable).

e.Adrawingdepictinghowthearticlewillbemarkedwiththeinformationrequiredbyparagraph4ofthisCTSO.

f.Identifyfunctionalityorperformancecontainedinthearticlenotevaluatedunderparagraph3ofthisCTSO(thatis,non-CTSOfunctions).non-CTSOfunctionsareacceptedinparallelwiththeCTSOauthorization.Forthosenon-CTSOfunctionstobeaccepted,theapplicantmustdeclarethesefunctionsandincludethefollowinginformationwiththeCTSOapplication:

(1)Descriptionofthenon-CTSOfunction(s),suchasperformancespecifications,failureconditionclassifications,software,hardware,and

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environmentalqualificationlevels.Includeastatementconfirmingthatthenon-CTSOfunction(s)donotinterferewiththearticle’scompliancewiththerequirementsofparagraph3.

(2)Installationproceduresandlimitationssufficienttoensurethatthenon-CTSOfunction(s)meetsthedeclaredfunctionsandperformancespecification(s)describedinparagraph5.f.(1).

(3)Instructionsforcontinuedperformanceapplicabletothenon-CTSOfunction(s)describedinparagraph5.f.(1).

(4)Interfacerequirementsandapplicableinstallationtestprocedurestoensurenon-CTSOfunction(s)compliancewiththeperformancedatadefinedinparagraph5.f.(1).

(5)Testplans,analysisandresults,asappropriate,toverifythatperformanceofthehostingCTSOarticleisnotaffectedbythenon-CTSOfunction(s).

(6)Testplans,analysisandresults,asappropriate,toverifythefunctionandperformanceofthenon-CTSOfunction(s)asdescribedinparagraph5.f.(1).

g.ProvideamanualdescribingthequalitysystemforreviewbytheauthorityinaccordancewithCCAR-21-R5Article21.358.ThequalitysystemshouldensurethatitwilldetectanychangetotheapproveddesignthatcouldadverselyaffectcompliancewiththeCTSOMPS,andrejectthearticleaccordingly.

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h.Materialandprocessspecificationslist.

i.Listofalldrawingsandprocesses(includingrevisionlevel)thatdefinethearticle’sdesign.

j.Manufacturer’sCTSOqualificationreportshowingresultsoftestingaccomplishedaccordingtoparagraph3.cofthisCTSO.

6.ManufacturerDataRequirements.

Besidesthedatagivendirectlytotheauthorities,havethefollowingtechnicaldataavailableforreviewbytheauthorities:

a.FunctionalqualificationspecificationsforqualifyingeachproductionarticletoensurecompliancewiththisCTSO;

b.Articlecalibrationprocedures(ifapplicable);

c.Schematicdiagrams;

d.Wiringdiagrams;

e.Materialandprocessspecifications;

f.Theresultsoftheenvironmentalqualificationtestsconductedaccordingtoparagraph3.dofthisCTSO.

g.Iftheequipmentincludessoftware,providerelevantdocumentsasspecifiedinRTCA/DO-178C,includingalldatasupportingtheapplicableobjectivesinRTCA/DO-178CAnnexA“ProcessObjectivesandOutputsbySoftwareLevel”;

h.Iftheequipmentincludescomplexelectronichardware,providedatarelatedtothedesignassurancelevelandhardwarelifecycleas

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definedinRTCA/DO-254AppendixATableA-1.Forsimpleelectronichardware,providethefollowingdata:testcasesorprocedures,testresults,testcoverageanalysis,toolassessmentandqualificationdata,configurationmanagementrecordsincludingproblemreports.

i.Ifthearticlecontainsnon-CTSOfunction(s),themanufacturermustalsomakeavailableitems6.athrough6.hastheypertaintothenon-CTSOfunction(s).

7.FurnishedDataRequirements.

a.IffurnishingoneormorearticlesmanufacturedunderthisCTSOtooneentity(suchasanoperatororrepairstation),provideonecopyofthedatainparagraphs5.aand5.bofthisCTSO.Addanyotherdataneededfortheproperinstallation,certification,use,orforcontinuedcompliancewiththeCTSO,oftheaircraftaudiosystemandequipment.

b.Ifthearticlecontainsdeclarednon-CTSOfunction(s),includeonecopyofthedatainparagraphs5.f.(1)through5.f.(4).

8.AvailabilityofReferencedDocuments.

a.IndustrystandarddocumentsmaybepurchasedfromIndustryStandardInformationServicePlatform:

/

,whereindustrystandardcontentcanbequeriedanddownloaded.

b.RTCAdocumentsmaybepurchasedfromRadioTechnical

CommissionforAeronautics,Inc.115018thStreetNW,Suite910,

WashingtonD.C.20036,USA.Theymayalsobepurchasedonlinefrom

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.

c.ITUdocumentsmaybeobtainedfromInternationalTelecommunicationUnion(ITU)officialwebsite:

/

,whereITUstandardscanbeaccessedanddownloaded.

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Appendix1TestRequirementsforAirborneVoIPPhones

IncorporatingAudioSystemsandEquipment

ForairborneVoiceoverInternetProtocol(VoIP)telephonesapprovedinaccordancewiththisCTSO,iftheyincorporateaircraftmicrophones(excludingcarbongranulemicrophones),headsets,receivers,loudspeakersandotheraudiosystemsanddevices,suchsystemsanddevicesshallmeettheminimumperformancestandardsspecifiedinAircraftAudioSystemsandEquipment(CTSO-C139a).

AirborneVoiceoverInternetProtocol(VoIP)telephonesincorporatingaircraftmicrophones(excludingcarbongranulemicrophones),headsets,receivers,loudspeakersandotheraudiosystemsanddevicesshallundergotestingunderthestandardconditionsmeetingtherequirementsofthisCTSOandCTSO-C139atoensureproperfunctionality,withthetestrequirementsandproceduresfortestingspecifiedinTable1.

Table1:AirborneVoiceoverInternetProtocol(VoIP)TelephoneTestRequirementsand

Procedures

TestFunctions

TestRequirementsandProcedures

TransmittedVoiceQuality

1.DuringacallusingtheairborneVoiceoverInternetProtocol(VoIP)phone,thetestershallbeabletoclearlyhearthe

sentencestransmittedbybothpartiesofthecall,withagoodauditoryexperience.

2.AdoptthesubjectiveMOSscoringscheme:

(1)UsetheChinesevoicesignalsspecifiedinITU-TP.501,specificallyasfollows:

FBehindthewarehouseisasmallhouse.Thesunrisesintheeast.

FHarbinisinthenorthernmostpartofChina.Breakfastissetonthekitchentable.

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MThepharmacyisalwaysclosed.Momisrestinginanotherroom.

MEverytimehecomes,hecarriesaheavybag.Helooksnomorethan18or19yearsold.

(2)Adopta5-pointscaleandtheAbsoluteCategoryRating

(ACR)method.Fourpeop