[Serusers] ENUM timeout to +33 - parallel resolvers, tuneable timeout

[Adrian Georgescu]

So there are answers out there!

I am also willing to sponsor the development of a paralel DNS resolver 
built in SER !

Regards,
Adrian

On Mar 16, 2005, at 9:03 PM, John Todd wrote:

> At 5:56 PM +0100 on 3/16/05, Adrian Georgescu wrote:
>> Hello Juha,
>>
>> The ENUM prefix for France +33 (3.3.e164.arpa) does not work, it is 
>> delegated but the servers do not answer and the resolver times-out in 
>> 12-20 seconds. If you prefer to do ENUM look-ups before going to 
>> normal PSTN this affect SIP call flows.
>>
>> Do you have any idea how to work around this problem? Besides fixing 
>> the DNS server side :)
>>
>> Regards,
>> Adrian
>
> [this post became somewhat non-specific to SER as I wrote it - 
> apologies.  However, it is directly relevant to most of the community 
> so I will post it.]
>
> One method would be to write custom resolver code for ENUM lookups 
> that has shorter timeouts for specific zones.
>
> Another "feature" of such a program could be to do parallel resolution 
> in an even more highly modified resolver, when there are several ENUM 
> root zones that a particular host may care about.  The requirement for 
> rapid timeout would also apply in these multi-threaded lookups, since 
> PDD is the most important thing to worry about when completing calls 
> (at least, currently delay is most important, IMHO.)  Perhaps being 
> able to give each zone a preference and timeout would be interesting, 
> too... let's expand on this.
>
>
> JT