A Inter-Cluster Trunk (Non-Gatekeeper Controlled) had been setup for site A and site B. Now I have one issue, site A (5xxx) can call and speak to site B (6xxx). But I got the busy tone when I tried to call site A from site B. I tried to reset the trunk, the issue is till there. And the css and partition setting looks good. Can anyone could show me how to do the troubleshoot?