SRV query with no domain?

Kevin Darcy kcd at
Wed Aug 15 16:52:18 UTC 2012

I don't believe SRV lookups use the "search" directive in 
/etc/resolv.conf; I think that's only for A (name-to-address) lookups. 
But I could be wrong on that...

It all comes back to: the client should know what domain contains the 
resources it's looking for. There's fundamentally no such thing as a 
"generic" SRV lookup; SRV lookups are always contextual to a particular 

As for your point about "tel:" URIs having no domain, I'm no IP 
telephony expert by any stretch of the imagination, but isn't ENUM used 
to map a phone number (as found in a "tel:" URI) to one or more domains 
for the SRV lookup(s)? Or am I way off-base here?

                                                             - Kevin
On 8/15/2012 12:06 PM, Thomas Secula wrote:
> That's what I tried to tell the OpenIMS folks. I have search mydomain 
> in/etc/resolv but somehow they aren't adding mydomain to the query. 
> This only happens when the  PCSCF tries to find the ICSCF after 
> receiving a SIP invite with a TEL uri which by definition has no 
> domain since it's in the pstn.
> I don't believe this is a bind issue as I would expect the P-CSCF to 
> get that NXDOMAIN and be able to handle it, likely an openims bug.
> thanks for all your replies!!!1
> On Wed, Aug 15, 2012 at 10:57 AM, Kevin Darcy <kcd at 
> <mailto:kcd at>> wrote:
>     There's no point in answering a "domain-less" SRV-record query,
>     since the whole point of the SRV record type is to allow clients
>     to find resources associated with a particular domain (and
>     protocol/transport).
>     You need to set the proper domain on the client doing the lookup.
>                                 - Kevin
>     On 8/15/2012 10:42 AM, Thomas Secula wrote:
>>     Hello,
>>     I hope this is the right list.. I am using bind 9.8.2on centos 6
>>     with a system called openims. I am trying to get my bind server
>>     to respond to an SRV query of _sip._udp where the query has no
>>     domain. I am told by the openims folks that I should be able to
>>     get my bind to respond but I have been unable to.
>>     If I do a dig it only works if I have a +search on the request.
>>     without teh +search I get NXDOMAIN back.
>>     Is this something I should expect bind to support?
>>     thank you...
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