RFC3263推荐使用DNS,接续过程为NAPTR-> SRV -> A or AAAA,逐一尝试。
详见http://mit.edu/sip/sip.edu/dns.shtml,还提供了很好的实践。
关于Naming Authority Pointer (NAPTR) :
ThisdocumentdescribesaDomainNameSystem(DNS)resourcerecordwhichspecifiesaregularexpressionbasedrewriterulethat,whenappliedtoanexistingstring,willproduceanewdomainlabelorUniformResourceIdentifier(URI).Dependingonthevalueoftheflagsfieldoftheresourcerecord,theresultingdomainlabelorURImaybeusedinsubsequentqueriesfortheNamingAuthorityPointer(NAPTR)resourcerecords(todelegatethenamelookup)orastheoutputoftheentireprocessforwhichthissystemisused(aresolutionserverforURIresolution,aserviceURIforENUMstylee.164numbertoURImapping,etc).
ThisallowstheDNStobeusedtolookupservicesforawidevarietyofresourcenames(includingURIs)whicharenotindomainnamesyntax.ReasonsfordoingthisrangefromURNResourceDiscoverySystemstomovingout-of-dateservicestonewdomains.
ThisdocumentupdatestheportionsofRFC2168specificallydealingwiththedefinitionoftheNAPTRrecordsandhowother,non-URIspecificapplications,mightuseNAPTR.
其中ENUM - The bridge between the switched telephony network and the Internet 很是有用
详见http://www.voip-info.org/wiki/view/ENUM
还有一篇中文的http://www.cnnic.net.cn/html/Dir/2004/02/17/2159.htm
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