[Devel] SRV defaults to UDP only

[Bogdan-Andrei Iancu]

Hi Tim,

if there is no NAPTR record, the protocol to be used is selected based 
on RUR information - if this does not contain any specific info (like 
transport parameter), UDP is used by default.

when doing DNS failover, you do not do it based on your server 
capabilities, but on the destination server capabilities. If NAPTR is 
not available, you have no clue what proto the destination server 
supports, so you cannot do a failover based on protocol.....

at least this is my understanding :)

regards,
bogdan

Tim Missner wrote:
> Hello,
>
> While trying to implement failover using DNS SRV records we have found 
> only udp is resolved as a transport, even if the proxy is configured 
> to use TCP.
>
> In resolve.c function sip_resolvehost it appears when no protocol is 
> set udp is the default.
>
> Is this by design?
>
> We never see _sip._tcp.domain.com being resolved.
>
> I was able to force this by setting *proto = PROTO_TCP sip_resolvehost.
>
> So my question is this, with the absence of NAPTR records how can we 
> get openser to lookup both upd and tcp SRV records?
>
> Thanks,
>
> Tim
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