True, but with all due respect, if the cache's TTL expires and the OP's PBX 
cannot reach an external DNS server, they have bigger problems ;-)

Slainte all!
The Mick

Sent from my iPhone

On May 30, 2011, at 9:41 PM, Mark Deneen <[email protected]> wrote:

> On Mon, May 30, 2011 at 2:44 AM, gincantalupo <[email protected]> 
> wrote:
> Hi,
> 
> it is a known problem, one of the worst. To avoid it:
> 
> - do not use urls, only ip addresses in sip.conf
> 
> or put your urls inside /etc/hosts (is what I do especially sip providers 
> urls)
> 
> or install a dns-cache on your pbx (maybe the best solution)
> 
> Giorgio
> 
> 
> 
> Even a dns cache won't help you forever.  Once the entry's TTL expires, your 
> cache won't be able to give you an answer until it can contact root servers 
> on the internet.
> 
> -M
> --
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