[Serusers] DNS SRV lookup issue

[Zeus Ng]

Set the domain/realm on your UA to testdomain.com instead of
sip.testdomain.com. In your SER config, set aliase="testdomain.com". That
shall do it.


Zeus

> -----Original Message-----
> From: Tan, Chiang Kang 
> Sent: Thursday, 24 February 2005 8:35 PM
> To: 'Zeus Ng'
> Cc: serusers at lists.iptel.org
> Subject: RE: [Serusers] DNS SRV lookup issue
> 
> 
> I have some issues with DNS mapping too. I want to have a sip 
> user with sip:user1 at testdomain.com. In my location table, I 
> however stored sip:user1 at machine1.testdomain.com as 
> machine1.testdomain.com maps to the actual IP address (I have 
> such an entry in /etc/hosts). Hence although a DNS SRV lookup 
> is performed, it tries to contact 
> _sip._udp.machine1.testdomain.com, which does not exist (I 
> only have SRV entry for _sip._udp.testdomain.com). I think 
> I'm missing something, can somebody tell me where?
> 
> Any help will be greatly appreciated.
> 
> cheers
> Chiang
> 
> -----Original Message-----
> From: Zeus Ng [mailto:zeus.ng at isquare.com.au]
> Sent: 24 February 2005 09:04
> To: 'Gandhi, Chetan'
> Cc: serusers at lists.iptel.org
> Subject: RE: [Serusers] DNS SRV lookup issue
> 
> 
> 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
>