one way audio and cross connection

i am using asterisk-1.2.30 , zaptel-1.2.27 , libpri-1.2.6, astguiclient_2.0.4 and i am using SIP .
i am facing a problem is that the customer is not able to here our voice clearly but we are able to here customer voice clearly this is happening when we are making the call from vicidial agc page .
but when i am making the call from soft phone directly then the audio is fine .
when am checking my server load average it shows the load average is 23 to 30% and asterisk is taking the cpu% some time 40% to 80% and mysqld-max is also taking some high load average
i m having a dual core processor .
OS is suse linux 10
3GB RAM
dial method is ratio and dial level is 1.5 with 10 agents
the CPU load average is high now a days but one way audio problem i m facing since long i have i change several voip carrier as well as bandwith too
i am facing a problem is that the customer is not able to here our voice clearly but we are able to here customer voice clearly this is happening when we are making the call from vicidial agc page .
but when i am making the call from soft phone directly then the audio is fine .
when am checking my server load average it shows the load average is 23 to 30% and asterisk is taking the cpu% some time 40% to 80% and mysqld-max is also taking some high load average
i m having a dual core processor .
OS is suse linux 10
3GB RAM
dial method is ratio and dial level is 1.5 with 10 agents
the CPU load average is high now a days but one way audio problem i m facing since long i have i change several voip carrier as well as bandwith too