I have just recently installed new Cisco 2901 routers with VIC2-4FXO cards in them. These routers are used as voice gateways at my branches. All branches are connected to Cisco Call Manager 6.1. After install, users at each branch have been experiencing an intermittant fast busy when dialing out to an external number (we hit 6 to dial externally). This just started happening when I replaced the 2650XM routers at each branch.