Noble Antony T wrote: > > Hi, > > I need some clarifications about the conversion of IM URI to SIP URI. > Thanks in advance... > > According to RCF3861 > > 3. Address Resolution <http://rfc.net/rfc3861.html#s3.> > > /The symbolic name used in the Service field of the SRV record is > "_im" for instant messaging... However, the advertisement of these > services in the DNS is incomplete if it does not include the protocol > that will be used to instantiate the instant messaging or presence > operations... > > ... the Protocol field of the SRV record contains an > IANA-registered label corresponding to the underlying instant > messaging or presence protocol being advertised. > / > > I need to send a MESSAGE with a request URI > im:fred at example.com <mailto:im:fred at example.com> > and it is to be resolved into corresponding SIP URI. > > what should I query to get the corresponding SIP URI..? I agree that this is a bit confusing. Unlike resolution of (say) an http: or mailto: URI, there are several steps involved in resolution of an im: URI. If you have im:fred at example.com then you need to resolve that to an address for a registered IM protocol: http://www.iana.org/assignments/im-srv-labels Surprisingly, there is only one registered IM protocol: XMPP. Did someone forget to register SIP/SIMPLE? Assuming that SIP/SIMPLE will be registered (and assuming that the registered <Proto> label will be "_sip") then you would attempt to resolve the target domain per Section 3 of RFC 3861. So you would attempt to resolve the following: _im._sip.example.com. That would result in a resolution to a domain that handles SIMPLE IM traffic for example.com, such as perhaps simple.example.com. Thus im:fred at example.com would resolve to sip:fred at simple.example.com. Or at least that is my understanding. Perhaps Jon Peterson is a better person to ask, since he authored RFCs 3859, 3860, and 3861. Peter -- Peter Saint-Andre https://stpeter.im/
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