FreeSwitch is a very powerful Softswitch that you should be considering if your some sort of hardcore asterisk user, its console mode is quite a bit different from the familiar asterisk cli. fs_cli can get very chatty if you have more than a few concurrent calls, in any case here are a couple of commands to get you sorted..
Disable anything lower than warning i.e. DEBUG, NOTICE, INFO:
Disable all SIP traces:
Enable sip tracing for a sofia sip profile named customers:
Thats it for now. it has been a while