It is definitely a firewall issue from centos default install.
iptables-save

service iptables stop

2012/11/7 Jeremy Ardley <jeremy.ard...@gmail.com>

>  On 11/07/2012 05:39 AM, kel...@sis-grenada.com wrote:
>
> I have recently installed kamailio on CentOS 6.3 and configured a couple of 
> SIP phone Linksys and Grandstream to test inercommunication. The SIP-Server/ 
> Kamailio server ha started and is listen on port 5060. The UA are sending 
> registered message to the SIP Server but there is no response from the SIP 
> server. I left the syslog at default but not seeing any messages on the 
> /var/log/messages. Can someone tell me if I have missed some configuration 
> information. Note: I registered two users 101 and 202 using the command 
> kamctl add 101 101. Is it possible to check whether the Users added have been 
> added to the system??. and does anyone have any idea how to to troubleshoot a 
> response from the Server. I am using Wireshark to monitor communication 
> between between UA and SIP Server
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing 
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>
>
> I have Kamailio running on Centos 6.3 with no issues. I run selinux as
> well.
>
> One thing I have found is that kamailio will not start if the config file
> is bad or there are stale pid or lock files. There is nothing obvious but
> checking if there is a process is a start and looking at /var/log/messages
> helps.
>
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>
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