17 Feb
2008
17 Feb
'08
11:05 p.m.
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?
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
Some of these can occur under normal conditions, 486 is busy for example, or 487 is
generated by a CANCEL.
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?
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>
To: Tobias Lindgren <tobias.lindgren(a)ip-only.se>
Cc: users(a)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:
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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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