the ser ottendorf announcement does mention improved timers. Cannot openser include this
feature too and cannot I merge ser with openser for good timers? I am still trying to
understand the difference between ser and openser but standart compliance seems to be very
important matter!
Cannot people provide me with some hints? I am sure that I am not the only who is asking
the difference between ser and openser. ser documentation does not appear uptodate, but
the software as sannounced appears impressive. I have already asked this question but did
not receive any answer.
thank you in advance!
rr
----- Original Message ----
From: Christian Schlatter <cs(a)unc.edu>
To: users(a)openser.org
Sent: Tuesday, November 7, 2006 10:52:56 PM
Subject: Re: [Users] TM : retransmission timers
Greg Fausak wrote:
Hello,
I believe this is a well known bug.
Granularity of timers is 1 second. So, if you sign up for a timer to
be fired in 1 second it will happen anywhere between 0 seconds and 1
second.
2 seconds will happen between 1 and 2 seconds. I usually set up my
timers to be 2, 2, 4, 8. There are VOIP providers that are pretty
sticky about
the first 500ms. If you are using one of them you're out of luck.
Yes, there is a timer process that wakes up every second to perform
retransmissions. I was actually quite surprised that OpenSER, which is
known to be very standards compliant, does not follow the RFC 3261
retransmission timeouts. On the other hand, the RFC 3261 timeout values
are just suggestions and standards compliant SIP UA must accept shorter
timeouts. Still it would be nice if OpenSER would support sub second
timers, this would allow for shorter fail-over times.
Christian
I believe SER has made timer changes to support more exact timer
intervals. They are a completely different camp, with a different feature
set (although they share the same roots).
-g
On 11/7/06, Jean-François SMIGIELSKI <jf-smig(a)ibelgique.com> wrote:
Hello,
I made strange observations about the intervals between
retransmissions with the TM module.
In my experiments, I used the default parameters for the TM module
timers, and I sent an INVITE that cannot receive answers (it has a
well known R-URI pattern that is forwarded to a place and port that
nobody listen).
When reading RFC3261, I expected to see intervals between
retransmissions of |500ms|1s|2s|4s|8s|16s|. 7 transmissions, during 32s.
But with OpenSER, (I have tested with the debian package 1.1.0-5 on a
debian etch, and the cvs sources for 1.1.0 or 1.0.1compiled by
myself), I can see intervals like <500ms, 2s, 4s, 4s,4s, ... until 26s
are spent (9 sendings). The first interval is sometomes very short
(40ms).
Altough I like the sequence of 4s separated transmissions, I do not
know why the first interval is so short, and why there is no sending
after 1s.
Did anybody observed such behaviours? Are they normal?
Thanks in advance!
JF Smigielski.
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http://web.ibelgique.com/
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