[OpenSER-Users] Failover using NAPTR/SRV

[Tobias Lindgren]

Hi Bogdan,

thanks for your information. Using blacklist=yes have caused som 
troubles for me in the past, but maybe it works better nowdays.

Br,
/Tobias

Bogdan-Andrei Iancu said the following on 2008-02-14 12:25:
> Hi Tobias,
> 
> if you have "dns_backlist=yes" in your config, if one of the destination 
> server fails (according to SIP definition), it's IP will be added to a 
> temporary blacklist (for 4 minutes) and not used. So, openser should do 
> dns-based failover and use the next entry provided by NAPTR/SRV/A lookup.
> 
> Regards,
> Bogdan
> 
> Tobias Lindgren wrote:
>> Hi all,
>>
>> I've been trying to find this information but I cannot find any exact 
>> specifications on how it really works.
>>
>>  From what I know using NAPTR/SRV records with OpenSER will allow it to 
>> find and use servers behind those DNS-records. This works just fine.
>>
>> However, what I'm not sure about is what actually will happen in OpenSER 
>> when one of two servers in this scenario would fail.
>>
>> For example, I have two servers as SRV where one is primary and one is 
>> secondary for SIP/UDP. What will happend in OpenSER when the primary 
>> server is down? Will OpenSER continue to send all request first towards 
>> that server or will it learn that one server is down and always send 
>> requests to the second server for a period of time and try the primary 
>> one just occassionally?
>>
>> Please direct me to any page where this is explained in detail, if such 
>> page exists.
>>
>> Br,
>> /Tobias
>>
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>