[Users] Best practice for DNS failover using OpenSER?

Greg Fausak lgfausak at gmail.com
Tue Jan 16 02:33:46 CET 2007

In the text below I quote Kerker 'SER does support DNS failover.'.
Is this ser or openser?  Where can I read more about this?


On Jan 15, 2007, at 10:40 AM, Klaus Darilion wrote:

>>>> Staffan,
>>>> Kerker Staffan wrote:
>>>> ...
>>>>> Now, if I disable one of the Gateways, I hang every second  
>>>>> call. OpenSER does
>>>>> not
>>>>> try the second A record address if the first doesn't answer.  
>>>>> How can I solve
>>>>> this? Shouldn't OpenSER fail over to the second A record listed  
>>>>> in the NAPTR
>>>>> => SRV
>>>>> resolving? Or will OpenSER continue to resend all SIP INVITES  
>>>>> until timers
>>>>> fire? Would
>>>>> it help if the proxy recieved an ICMP port/destination  
>>>>> unreachable from the
>>>>> network? Is
>>>>> there anyway to get around this? In the other direction, from  
>>>>> POTS to sip,
>>>>> the PGW2200
>>>>> nicely switches over to the second of my two OpenSER servers if  
>>>>> I shut one of
>>>>> them down. These servers have the same DNS entries (but for  
>>>>> another SIP domain, NAPTR =>
>>>>> SRV => 2x A record).
>>>> Yes, OpenSER or for that matter every transaction stateful proxy  
>>>> should
>>>> do RFC 3263 based fail-over. But as you can imagine this is pretty
>>>> complex to implement and that's why openser does not support it  
>>>> yet, it
>>>> is listed on the development roadmap. The newest release of SER  
>>>> does
>>>> support DNS failover.

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