Newly installed CS 1000E 5.5 fully patched as of 5/1/09. In bound calls calling 800# hits thru-dial service in CP and caller enters extension number. Call goes thru fine but after about 55 seconds call drops everytime. Reprogrammed to ring extension bypassing CP and still dropped. 800# comes in via a LD T-1 and I don't think it's a T-1 issue because outbound traffic over same T-1 work fine. Anyone ever have this happen before and any ideas on what to check????