Introduction
This guide will talk about how to stress test an asterisk installation, IE generate calls with in asterisk so you can see at what point your system will start to give bad audio out to a caller.
First things first
for this you will need:
1 asterisk 1.4 or 1.6 or later installation of asterisk running on a 32bit installation of centos.
Instructions and configuration
1) download and install SIPP “yum install -y sipp”
2) edit sip.conf and enter
[sipp]
type=friend
context=sipp
host=dynamic
port=6000
user=sipp
canreinvite=no
disallow=all
allow=ulaw
3) edit extensions.conf and enter
[sipp]
exten => 2005,1,Answer
exten => 2005,2,SetMusicOnHold(default)
exten => 2005,3,WaitMusicOnHold(20)
exten => 2005,4,Hangup
4) run “service asterisk stop” to stop the current session of asterisk
5) load asterisk in debug mode “asterisk -vvvvvvvvvvvvvvvvvvgc”
6) run “sipp -sn uac -d 20000 -s 2005 IP.OF.YOUR.BOX -l 30”
the above command will send 30 concurrent calls in to asterisk and extension 2005 will answer and place them on hold for 20 seconds and play music on hold, you can then dial into the system and hold a conversation with someone while slowly increasing the number of calls to see at what point calls become in-audible.
if you are also graphing the CPU and Memory useage this is a good way to do burn in tests and see how the hardware responds to the system constantly being used for a period of 24 Hours etc…
expected output from SIPP
------------------------------ Scenario Screen -------- [1-9]: Change Screen --
Call-rate(length) Port Total-time Total-calls Remote-host
10.0(20000 ms)/1.000s 5061 6.01 s 59 10.0.2.10:5060(UDP)
10 new calls during 1.000 s period 14 ms scheduler resolution
46 calls (limit 161) Peak was 47 calls, after 5 s
0 Running, 46 Paused, 0 Woken up
244 out-of-call msg (discarded)
1 open sockets
Messages Retrans Timeout Unexpected-Msg
INVITE ----------> 59 0 0
100 <---------- 57 0 2
180 <---------- 0 0 0
183 <---------- 0 0 0
200 <---------- E-RTD1 57 0 0
ACK ----------> 57 0
Pause [ 0ms] 57 11
BYE ----------> 0 0 0
200 <---------- 0 0 0
------ [+|-|*|/]: Adjust rate ---- [q]: Soft exit ---- [p]: Pause traffic -----
Asterisk Debug
-- Executing [2005@sipp:1] Answer("SIP/sipp-085759b8", "") in new stack
-- Executing [2005@sipp:2] SetMusicOnHold("SIP/sipp-085759b8", "default") in new stack
-- Executing [2005@sipp:3] WaitMusicOnHold("SIP/sipp-085759b8", "20") in new stack
-- Started music on hold, class 'default', on channel 'SIP/sipp-085759b8'
-- Executing [2005@sipp:1] Answer("SIP/sipp-0858ff38", "") in new stack
-- Executing [2005@sipp:2] SetMusicOnHold("SIP/sipp-0858ff38", "default") in new stack
-- Executing [2005@sipp:3] WaitMusicOnHold("SIP/sipp-0858ff38", "20") in new stack
-- Started music on hold, class 'default', on channel 'SIP/sipp-0858ff38'