Your ISP/Telco/provider.Should be able to advice you on all your entitlement for a curcuit(cc) connections.It all depends on how much traffic you paid for.
You have to bear in mind they will have to do intrusive and non-intrusive tests whenever a cc is causing problems e.g CRCs errors/and frame drops.In this case this means intruding to the cct connections they provided you.
lets face it 97% should be cool for your network.the 3% us used for moniroting purposes just in case a very sensetive CCT goes down they will inform you straight away(something u need especialy if you dont have a 24 hr SNMP monitoiing platform in place)..