
usingaSITtone.ListentotheRTPstream,ortheWAVfileintheQueuedirectorytodeterminewhataudiois
beingreceived.
6D7A Ringbackdetectedwithnoanswer:Callwasnotansweredintheconfiguredtimeperiod.Thetimeris45
seconds.
6D7B Fastbusytonedetected:The
numberisnotinserviceorthecallhasbeenrejectedatapointbeyondthe
TDMnetwork.AdestinationnumberonaPRI,T1orDIDtrunkwhenthetrunkisdowncanresultinafast
busy.
0x6F00–SIP400Messages
6F04 404Notfound:ThegatewayrejectedtheinitialINVITEwithageneric“404Notfound,”anddidnotinclude
anadditionalQ.850causecode.ThiscouldbebecausenoSIProutecouldbefoundforthedestination
phonenumber.
6F50 480TemporarilyUnavailable:ThegatewayrejectedtheinitialINVITEwith
ageneric“480Temporarily
unavailable”anddidnotincludeanadditionalQ.850causecode.
6F56 486Busyhere:ThegatewayrejectedtheinitialINVITEwithageneric“486Busyhere,”anddidnotinclude
anadditionalQ.850causecode.
5F57 487Requestterminated:Anin‐progressbutnotyetanswered
callwasterminatedbyaBYEorCANCEL.This
canbecausedbythegatewayhavingashorterno‐answertimeoutthanIPFax,andsoterminatesthecall.
6F58 488Notacceptablehere:ThegatewaydoesnotsupporteithertheG.711µorT.38codec.
0x7000 –SIP500 Messages
7000 500ServerInternalError:Thegatewayencounteredanunexpectedconditionthatpreventeditfrom
fulfillingtherequest.
7003 503ServiceUnavailable:ThegatewayrejectedtheinitialINVITEwithageneric“503Serviceunavailable.”
Thiscouldbeduetolackofsystemresources,overload,oradministrativemaintenance.
0x7100 –SIP600 Messages
600classerrorstypicallyindicatefatalerrorsintheSIPgatewayornetwork.
0x7200 –Q.850CauseCodes
FormoreinformationonQ.850causecodes,pleaseseeITU‐TpublicationQ.850.Allcausecodesoriginatefromthe
TDMnetworkandarepassedthroughthegatewaytoIPFax.
7201 Cause1,Unallocated(unassigned)number:TheTDMnetworkcouldnotconnectthecallbecausethe
numberisnotinservice.
7210 Cause16,Normalcallclearing:Theremotefaxdevicehungupbeforethefaxwascompleted.Thegateway
includedaQ.850causecode16,whichindicatesthatthecallhungupina“normal”fashion,i.e.therewas
noTDMnetworkerror.
7211 Cause17,Busy:TheTDMnetworkrejected
thecallbecausethedestinationnumberisbusy.
721C Cause28,Invalidnumberformat:TheTDMnetworkwasunabletoroutethephonenumber.SomeTDM
networksusethiscausetoindicatenumbersthatarenolongerinservice.
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