Locating SIP Services in DNS

最新推荐文章于 2025-08-09 22:38:46 发布

iteye_19871

最新推荐文章于 2025-08-09 22:38:46 发布

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本文介绍了RFC3263中推荐的使用DNS进行SIP接续的过程，即通过NAPTR->SRV->AorAAAA记录来完成寻址。此外，文中还解释了NamingAuthorityPointer (NAPTR)资源记录的作用，并提供了有关ENUM系统的实用信息。

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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