[Users] TM : retransmission timers

[Greg Fausak]

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.

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 at 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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-- 
Greg Fausak
greg at thursday.com