SRV Lookup

  • dose

    dose - 2011-08-05

    Hi Guys,

    I'm trying to register to my sipxecs server but I can't, it looks that your application doesn't support SRV lookup, can't you confirm  me it please?

    Best Regards

  • yohannmartineau

    yohannmartineau - 2011-08-16


    that's right, unfortunately, peers does not support srv lookup. Sorry for late answer, I'm just back from vacation.

    You can add a feature request if you want. This would require modifications on default jre dns stack. I know there's a java library that can send / receive custom dns requests, but I can't remember its name. Google would probably help on this…

  • Rick van Rein

    Rick van Rein - 2012-12-11


    The library you are talking about almost certainly is dnsjava

    I also ran into the problem of missing SRV records, and was actually surprised to run into it; given that SOHO routers bluntly take hold of port 5060 and turn it into something locked-down and useless, life without SRV records is a bit hard to handle for many of us.

    RFC 3263 prescribes SRV records for SIP URIs without a port number.

  • Rick van Rein

    Rick van Rein - 2012-12-12

    I dived in and got SRV records working with a minimal patch. This does incorporate a dependency on dnsjava though, a 200 kB JAR. The JAR includes a lot more than is actually needed, it should be straightforward to trim it to SIP Peers' purposes at about 50 kB.

    After downloading version 2.1.3 from you can install it with Maven using

    mvn install:install-file -DgroupId=org.xbill.DNS -DartifactId=dnsjava -Dversion=2.1.3 -Dfile=/path/to/dnsjava-2.1.3.jar -Dpackaging=jar

    If I had it my way, I would actually prefer to change SIP Peers to iterate over multiple offers (at the SRV level and at the A/AAAA level) so it has all chances possible to reach a remote party. This would also be helpful when supporting IPv6 aside IPv4, of course, which is what I am hoping to achieve.

    I hope this is useful.


    Last edit: Rick van Rein 2012-12-13

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