Voice Breakage

im using asterisk version 1.2 with vicidial version 2.0.4-122 on CentOS 5.0 with 22 agents.
im having problem with voice breakage and voice destortion.
im using IBM Systemx 3200 machine with T1 link.
Can any one help me.

By T1 link you mean you have a PRI Card in the box ? Vicidial uses meetme which needs a timing source. Ztdummy does not work well for it. Also it is very CPU intensive. If you have a PRI card in the server check the CPU level. If you are using Ztdummy you may want to recompile your kernel to work a bit better (there is a step by step in the Vicidial documentation).