Sometimes when a supervisor is monitoring an ACD agent on an IDS432 system, the supervisor can only here the agent and not the calling party. It works correctly most of the time. When the supervisor can't hear the calling party, we've tried to hang up and re-monitor, but with the same result. It won't work correctly again until we monitor another call or agent. The problem doesn't appear to be dependent on one agent...it happens to them all occasionally. It's possible that the problem only occurs for calls on one trunk. Has anyone seen this problem before? Any suggestion as to what I should try to solve it would be appreciated.