[Users] SIP clients and DNS SRV

[Paul van Schagen]

Hello Zen, 

We sell GS in the Netherlands on our website www.voipwereld.nl and
therefore we tested DNS SRV on a number of different GS models. DNS SRV
works with Grandstream HT 488/496 boxes perfectly. These boxes
automatically detect if one SIP server is down and move over to the next
one. 

DNS SRV is also implemented in GXP-2000 but appears to do a DNS query
once at start up instead of  before every call. 
This is not perfect and should be done before every call or REGISTER
without need for a reset. This will be fixed next firmware release of
the GXP-2000 according to GS.

Best regards
Paul van Schagen



-----Oorspronkelijk bericht-----
Van: users-bounces at openser.org [mailto:users-bounces at openser.org] Namens
Zen Kato
Verzonden: woensdag 26 oktober 2005 13:45
Aan: helge at smartnet.no
CC: users at openser.org
Onderwerp: Re: [Users] SIP clients and DNS SRV

Hi,

I posted on [serusers] regarding DNS SRV,t_replicate,backup server and
GS phones.
My test resut of BT101(1.0.7.11-newest) and GXP2000(1.0.1.9) was
no good.

My question is eventhough we set up DNS SRV on server side, if sip
clients does not suppot DNS SRV, do we have a risk of (5+5)minutes
out of service time when we set up 5 minutes REGISTER intervals?

If UA have multiple REGISTERs outgoing lines such as GXP2000,
we could set up Line1 for sip1&sip2(DNS SRV) Line2 for sip3 server.
In this case if line1 does not work, the user can use Line2.

Xlite can register 3 sip servers, but only default sip proxy can
use as outgoing line, so the Xlite users have (5+5)minutes out of
service risk.

Does Cisco 7960 work perfectly on DNS SRV?

Regards,

Zen 

Helge Waastad wrote  :

> Hi,
> I've started to add some more information to voip-info.
> I'm still waiting for response from Grandstream and others on their
> support (or future support) for DNS SRV.
> 
> br hw
> 
> On Wed, 2005-10-19 at 17:32 +0200, Klaus Darilion wrote:
> > Hi Helge!
> > 
> > According to my tests, also SNOM can do SRV based failover.
> > 
> > I've published my test results at:
> > http://www.voip-info.org/wiki/view/SRV+implementations
> > 
> > Please add your test results to this.
> > 
> > regards
> > klaus
> > 
> > Helge Waastad wrote:
> > > Hi,
> > > this is not a technical question regarding OpenSER, but more of
req for
> > > information.
> > > 
> > > I'm using Cisco phones and gateways and have implemented DNS SRV
> > > redundancy.
> > > However, I have never seen a SIP phone that really works with DNS
SRV
> > > redundancy, except from Cisco. (which actually works as a charm)
> > > 
> > > Does anyone know other phones that can use dns srv for redundancy?
> > > 
> > > At least Cisco tries the next DNS SRV entry if it receives a port
> > > unreachable from the highest priority proxy...
> > > 
> > > 
> > 
> -- 
> mvh/best regards
> Helge Waastad
> System Engineer
> Smartnet
> (+47)67830017
> 
> _______________________________________________
> Users mailing list
> Users at openser.org
> http://openser.org/cgi-bin/mailman/listinfo/users
> 

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