SIPp is a test system, it approximates the correct algorithm by implementing T1
and a retry counter.
Only some messages go 3,6,12,etc. others stay at a flat 3 - that is implemented
correctly and there is a max retry counter for each type.
You can set the values for T1 and the two max retry counters on the command
line. The default values give you the correct protocol defaults and you can
manipulate them to control T1 and F. T2 is not implemented (you don't get there
with default T1 and F).
Peter
Date: Tue, 20 Jul 2010 06:32:54 -0500
From: shemida.art...@gmail.com
To: sipp-users@lists.sourceforge.net
Subject: [Sipp-users] Clarification regarding usage of Timers-T1,T2 and F in
SIPp
I would like to get my doubts clarified regarding SIPp.
I would like to know how to use T1,T2 and F timers in SIPp.
I have to do this when I send a MESSAGE with T1 value set to 3 secs, T2 value
set to 16 secs and F value set to 30 secs.
Second SIP MESSAGE transmitted after 3 seconds (i.e. after T1 expires) and
subsequently the SIP MESSAGE is transmitted in 6 sec, 12 sec.etc ( i.e. T1 sec,
2 *(2*T1) sec, 2 *2*(2*T1) sec, 2*2*2*(2*T1) .etc) time interval till the time
interval reach to 16 Sec (T2 Timer).
After reaching the re-transmission interval to 16 sec (T2 timer), then the SIP
MESSAGE will be re-transmitted after every 16 sec till the sum of the T1 and T2
time intervals reaches to the SIP Timer F expires (i.e. 30 sec).
The SIP MESSAGE is transmitted for 30 seconds (i.e. till Timer F expiry) in 3
sec, 6 sec, 12 sec, and 16 sec time intervals.
Note
: The last SIP MESSAGE re-transmission (i.e. 16 second interval) may not
happen, because the total sums of time intervals cross the SIP timer expiry
(i.e. 30 sec- Timer F).
Please clarify my doubt.
Thanks in advance,
Regards,
Shemida
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