[SR-Users] NAPTR priorities doesn't seem to work properly

[Iñaki Baz Castillo]

2011/6/15 Alex Hermann <alex at speakup.nl>:
>> However I've seen other SIP stacks also performing failover by taking
>> next NAPTR records. But indeed, RFC 2915 does not mandate it, instead
>> it says MUST NOT. So you are right.
>
> I forgot about a discussion i had about this issue a few years ago with a
> customer and just remembered the outcome now. (Optional) failover can be
> provided by different 'Preference' field within the same 'Order'. From rfc
> 2915/3403 section 2:
>
>      The important difference between Order and Preference is that
>      once a match is found the client MUST NOT consider records with a
>      different Order but they MAY process records with the same Order
>      but different Preferences.  I.e., Preference is used to give weight
>      to rules that are considered the same from an authority
>      standpoint but not from a simple load balancing standpoint.

Yes, 100% right.


> Unfortunately this wasn't possible with Kamailio <=1.5. Have you tried 3.x
> with equal 'Order' but different 'Preference' or just with different 'Order'?

Not yet, but I'll do it and comment here :)

-- 
Iñaki Baz Castillo
<ibc at aliax.net>