[Users] Best practice for DNS failover using OpenSER?

[Jiri Kuthan]

indeed, the stuff is not well linked, we are working on it. Here you go.
http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/sip_router/doc/dns.txt?rev=HEAD&content-type=text/vnd.viewcvs-markup

-jiri

At 02:46 16/01/2007, T.R.  Missner wrote:
>Greg,
>
>This is a ref to SER. Apparently this functionality has been added to the new pre-release version. I did find some talk about it in the release notes.
>I couldn’t find any specific documentation. Admittedly I don’t understand the layout of SER’s site very well as I haven’t spent much time there.
>
>-- TR
>
>
>On 1/15/07 8:33 PM, "Greg Fausak" <lgfausak at gmail.com> wrote:
>
>In the text below I quote Kerker 'SER does support DNS failover.'.
>Is this ser or openser?  Where can I read more about this?
>
>-g
>
>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 =>
>
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>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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--
Jiri Kuthan            http://iptel.org/~jiri/