17 Feb
2008
17 Feb
'08
8:53 a.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:
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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>
>
>
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>
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