[Kamailio-Users] Question regarding TM module DNS failover with SRV records

[Daniel-Constantin Mierla]

Hello,

On 12/10/09 5:29 AM, Nathan Angelacos wrote:
>
> According to the 1.5.x TM module documentation,
> DNS failover is triggered by a 503 reply or a timeout.
>
> When using SRV records, it appears a 503 triggers the failure_route 
> instead.
>
> Given:
>
> host -t srv _sip._udp.voip.example.net
>  _sip._udp.voip.example.net has SRV record 1 0 5060 
> fast-server.example.net.
>  _sip._udp.voip.example.net has SRV record 2 0 5060 
> slow-server.example.net.
>
> On an invite to voip.example.net, if fast-server does not respond 
> within "fr_timer" seconds, t_relay fires off a serial branch 
> (t_on_branch is triggered) and the invite goes to slow-server.
>
> If fast-server responds with a 503, the t_on_failure route is 
> triggered instead, and the invite is not sent on to slow-server.
>
> If its not a bug in the module, does anyone have  clues of how to coax 
> the next DNS SRV record out of the t_on_failure route?  Or what can be 
> done to get t_relay to consume the 503?
>
does the 503 reply include a retry-after header?

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
* http://www.asipto.com/