18 Feb
2008
18 Feb
'08
1:25 p.m.
Douglas,
Douglas Garstang wrote:
Ok, so rfc3263 defines what the user agent should do
when a 503 reply,
or no reply is received.
What about the rest of the possible SIP replies?
the RFC defines the standard ways
to detect SIP failures (transport and
signalling) - both the detection and failure should be done accordingly.
We use several different ITSP's. I just checked the logs for our last
50,000 calls from all of them and there was a total of 19 different
replies received.
They are:
200,400,401,403,404,408,410,480,484,486,487,488,500,501,502,503,504,603
yes, but not all this replies indicate a failure of the GW (case which
interests you) - many negative replies indicates an unsuccessful call
setups and has nothing to do with the failure of the GW itself.
This was the main RFC idea - how do identify a failure of the SIP point
and not the failure of the call.
Some of these can occur under normal conditions, 486
is busy for
example, or 487 is generated by a CANCEL.
correct - also probably 408 timeout.
What about the rest? Most of the rest can be classified as error
conditions. Are you saying that if another error condition besides 503
is received that you don't do failover? Why?
Again, are these errors, call
errors or GW permanent errors (which will
make you want to disable routing to that GW) ? Because it is the GW duty
to correclty report the failure and the nature of the failure.
Have you tried to see what are the errors behind the negative replies
you get from GW??
Regards,
Bogdan
Douglas.
----- Original Message ----
From: Bogdan-Andrei Iancu <bogdan(a)voice-system.ro>
To: Douglas Garstang <dougmig33(a)yahoo.com>om>; users openser.org
<users(a)openser.org>
Sent: Friday, February 15, 2008 5:56:45 AM
Subject: Re: [OpenSER-Users] Failover using NAPTR/SRV
Of course it is.....by IETF - see RFC3263.
4.3 Details of RFC 2782 Process
Regards,
Bogdan
Douglas Garstang wrote:
Well that's weird. What do you mean by
'fail'? I thought dns_blacklist
was used when a 503 response was received? What if the connection
times out? What if another negative reply is received? Is this stuff
documented anywhere?
----- Original Message ----
From: Bogdan-Andrei Iancu <bogdan(a)voice-system.ro
<mailto:bogdan@voice-system.ro>>
To: Tobias Lindgren
<tobias.lindgren(a)ip-only.se
<mailto:tobias.lindgren@ip-only.se>>
Cc: users(a)openser.org
<mailto:users@openser.org>
Sent: Thursday, February 14, 2008 3:25:33 AM
Subject: Re: [OpenSER-Users] Failover using NAPTR/SRV
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:
towards
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 > 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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