[Serusers] DNS SRV lookup issue

[Chetan Gandhi]

Thanks Zeus.

The problem is solved. In the Contact address I had the port well i.e.
user at testdomain.com:5060. Once I removed the port, the SER did do SRV
lookup.

Just to learn from it, do you if this a SIP/SRV protocol nuance or a
SER implementation issue ?

thanks,
Chetan


On Thu, 24 Feb 2005 20:04:03 +1100, Zeus Ng <zeus.ng at isquare.com.au> wrote:
> Are you absolutely sure the contact address is stored as user at testdomain.com
> and not user at some.ip.address in the location table? I'm sure t_relay() will
> do SRV lookup, with one condition. The URI should be in the form
> sip:user at testdomain.com, with no port specified. If the URI does have the
> port included like sip:user at testdomain.com:5060, then SER will not do SRV
> lookup.
> 
> Most UAs I saw use IP address in contact header and that means no SRV
> lookup. Better check yours with serctl ul show.
> 
> You can verify the SRV lookup with the following script.
> 
> loadmodule "/usr/local/lib/ser/modules/tm.so"
> 
> route{
>        rewritehost("stupid.domain");
>        t_relay();
> }
> 
> The ethereal output will show SRV lookup.
> 
> Zeus
> 
> > -----Original Message-----
> > From: serusers-bounces at lists.iptel.org
> > [mailto:serusers-bounces at lists.iptel.org] On Behalf Of Gandhi, Chetan
> > Sent: Wednesday, 23 February 2005 9:15 AM
> > To: serusers at lists.iptel.org
> > Subject: [Serusers] DNS SRV lookup issue
> >
> >
> > Hi All,
> >
> >
> >
> > I am facing problem to get SER to do a SRV lookup. I have the
> > following scenario.
> >
> >
> >
> > Step 1:
> >
> > SIP UA1 registers with SER (testdomain.com) with contact
> > address user at testdomain.com
> >
> > SIP UA2 registers with SER (testdomain.com) with contact
> > address user at testdomain.com
> >
> >
> >
> > Step 2:
> >
> > SIP UA3 calls user at testdomain.com
> >
> >
> >
> > Problem
> >
> > I would expect SER to do a DNS SRV lookup on testdomain.com
> > and get sip1.testdomain.com and sip2.testdomain.com.
> > Unfortunately, SER only does A and AAAA query. (verified via
> > ethereal) and does not do SRV lookup. How can I make it do
> > SRV lookup ? I am using the default ser.cfg file.
> >
> >
> >
> >
> >
> > DNS entries
> >
> > _sip._udp.testdomain.com.                     3600     IN
> >     SRV     0          1          5060     sip1.testdomain.com.
> >
> > _sip._udp.testdomain.com.                     3600     IN
> >     SRV     0          1          5060     sip2.testdomain.com.
> >
> >
> >
> > I am trying to do load balancing but the SRV lookup failure
> > has got me stuck. Any pointers would be really appreciated.
> >
> >
> >
> > Thanks,
> >
> > Chetan
> >
> >
> 
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
>