Test tool: 
SIPp 1.1rc6 : http://sipp.sourceforge.net/index.html
Asterisk SVN-trunk-r48400M
OS : Scientific Linux 4.1 full install : https://www.scientificlinux.org/
CPU:Intel Pentium 4 3G/HT disable
RAM:1G DDR2
eth0:192.168.0.2 gateway 192.168.0.1
eth1:192.168.10.119 (we do test on this interface)
DISABLE FIREWALL / IPTABLES 


Dowanload and make sipp:
#tar zxvf sipp-1.1rc6.tar.gz
#cd sipp-1.1rc6
#make ossl
You will get a executable file named sipp.

Create SSL key for SIPp:
1.openssl genrsa -out cakey.pem 1024
2.openssl req -new -key cakey.pem -out trustcerts.pem
3.openssl req -x509 -key cakey.pem -in trustcerts.pem > cacert.pem

P.S SIPp needs cakey.pem and cacert.pem to enable ssl func.Just put thest two files in sipp-1.1rc6 directory.

Now we can start,There are 4 mode to test:
A:TCP one socket
B:TCP multi socket
C:TLS one socket
D:TLS multi socket

Src: sipp client
Dst: an random conference room ,in this doc. we use 133 for the conforence number.

Action:
use the following command to make a sipp call,when sipp has 56(or more) calls for asterisk,press ctrl+c to shutdown sipp.So we can see if asterisk handles the error or not.

= = =

Test command(normal test):
A mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sn uac -t t1 -mp 5788
B mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sn uac -t tn -mp 5788
C mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sn uac -t l1 -mp 5788
D mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sn uac -t ln -mp 5788

Result:
A:ok
B:ok
C:ok
D:system response "[Dec 12 11:39:04] ERROR[30065]: chan_sip.c:15507 siptls_accept: SSL accept error : wrong version number"

= = =

Test command(error test,where test.xml is an incomplete SIPp script):
A mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t t1 -mp 5788
B mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t tn -mp 5788
C mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t l1 -mp 5788
D mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t ln -mp 5788

Result:
A:ok
B:system hangup and no response till shutdown sipp ,system response "  == Accepted TCP connection fd 16 from 192.168.100.119:36930"
C:ok,thought system response [Dec 12 11:41:30] ERROR[30065]: chan_sip.c:15189 sipsock_read: TLS SSL_ERROR_SYSCALL
D:system response "[Dec 12 11:42:05] ERROR[30065]: chan_sip.c:15507 siptls_accept: SSL accept error : wrong version number"

= = =

Test command(error test Part II,this time we tell SIPp that we did use eth1):
A mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t t1 -mp 5788 -i 192.168.10.119
B mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t tn -mp 5788 -i 192.168.10.119
C mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t l1 -mp 5788 -i 192.168.10.119
D mode:./sipp 192.168.10.119:5060 -s 133 -r 3 -rp 2000 -p 4456 -l 56 -sf test.xml -t ln -mp 5788 -i 192.168.10.119

Result:
A:ok
B:system hangup and no response till shutdown sipp ,system response "  == Accepted TCP connection fd 23 from 192.168.10.119:36843" then stop response.
C:ok
D:system response "ERROR[2609]: chan_sip.c:13038 siptls_accept: SSL accept error : wrong version number"