[Asterisk-Users] Random disconnect of calls

[rescue at port11.net]

Hi

I am experiencing some weird behaviour. Calls get disconnected random. 
There is no error in the log files.

Sometimes I can talk over 30minutes+ and it is fine. Just earlier I was 
only able to talk 2 minutes per session and get disconnected. All I hear 
when this happens is a fast busy.
My set up is this: 8 * Grandstream Budge Tone 101. 4 * X100P cards. 
Compaq 1Ghz ML Server.
I am running Asterisk 0.7.2 installed from RPM's on Fedora.

The CPU load of the machine is fine

What I noticed and I do not know if this is related to the problem but 
the messages file of asterisk has the following entrys:
Apr 12 11:11:50 WARNING[-1210991696]: Maximum retries exceeded on call 
9dabd34a2383e5bd at 192.168.1.113 for seqno 102 (Request)
Apr 12 11:14:20 WARNING[-1210991696]: Maximum retries exceeded on call 
d92d9f87897a468a at 192.168.1.113 for seqno 102 (Request)

I am not using NAT asterisk is on an internal ip.

Thanks for you help.