Q.850到SIP 的代码转换表

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1、Hangup_CausesThedefaultcodeisNORMAL_CLEARING(ifyoudonotspecifyone)Thecodesaredocumentedinsrc/switch_channel.candSIPProtocolMessagesIEstandsforInformationElementQ.850toSIPCodeTableThefollowingtabledescribesthemappingsimplementedbyFreeSwitch(seemod_sofia.c:ha

2、ngup_cause_to_sip).Unspecifiedcausescodes(novalueinthe"SIPEquiv."columninthetable)aretranslatedtoSIP"480TemporarilyUnavailable"byFreeSwitch.Thetablealsocontainsnon-standardcodesabove127(ISUPandISDNonlyspecifycodesupto127).ThesecodesareusedinternallytoFreeSw

3、itchtoindicateotherstates.(ThesecodesdonotmapdirectlytoSIPerrorcodeseither.)ThecompletelistofSWITCH_CAUSE_codes(switch_call_cause_t)isdefinedininclude/switch_types.h.SeeITU-TQ.850standardforaformaldefinitionofstandardtelephonydisconnectcausecodesforISDN,and

4、themappingbetweenQ.931(DSSS1)andISUPcodes.SeeITUQ.1912.5foraformaldefinitionofinteroperabilitybetweenISUPandSIP,especiallysection6.11whichspecifiesthe"Reason"headerandgivesthemappingofthedisconnectcausecodesbetweenISUPandSIP.AnothersetofmappingsaretheQ.SIG/

5、SIPmappingsfromRFC4497section8.4.1.(Q.SIGisoneofmanyextensionstoQ.931usedforPBX-to-PBXsignallingonprivatelinks.)InpracticeitappearsthatFreeSwitchimplementsneitherQ.1912.5norRFC4497.ITU-TSIPQ.850EnumerationCauseDescriptionEquiv.CodeThisisusuallygivenbytheUns

6、pecified.routerwhennoneoftheotherNoothercausecodesapply.Thiscause0UNSPECIFIEDcodesusuallyoccursinthesameapplicable.typeofsituationsascause1,cause88,andcause100.ThiscauseindicatesthatthecalledpartycannotbeUnallocatedreachedbecause,althoughthe(unassigned)1404

7、UNALLOCATED_NUMBERcalledpartynumberisinanumber[Q.850validformat,itisnotvalue1]currentlyallocated(assigned).2404NO_ROUTE_TRANSIT_NETQ.850toSIPCodeTable1Hangup_CausesNoroutetoThiscauseindicatesthatthespecifiedequipmentsendingthiscausetransitnetworkhasreceived

8、arequestto(nationaluse)routethecallthrougha[Q.850]particulartransitnetwork,whichitdoesnotrecognize.Theequipmentsendingthiscausedoesnotrecognizethetransitnetworkeitherbecausethetransitnetworkdoesnotexis