Huh? Phones do a NAPTR/SRV lookup in a specified domain to get a list of SRV records to use. The phones don't query the DNS server every time they make a call... they have a cache. You also run primary and a secondary (or two primary) dns servers. It's a simple scalable solution. It's a shame Asterisk doesn't support it.


The only thing Asterisk would use an SRV lookup for is handing calls off to a carrier for termination right? The phones are the ones that need the SRV to try to have a redundant setup and I believe there is nothing wrong at all on relying on this - the whole world relies on DNS and since its inception, there has never been a total failure of the DNS network....pretty reliable if you ask me. For my Polycom, this is a great setup.

The only thing is I want to be sure I understand the statement above because the only time I can see Asterisk needing to do an SRV lookup is if it is handing a call to a carrier for termination.

- Gabe

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