1. At least one non-transitory computer readable medium encoded with instructions that, when executed, cause at least one processing unit to perform actions comprising: receiving a call, including a number called; routing the call to a call flow service, wherein the call flow service is selected, based at least in part, on a load of the call flow service; after receipt of the call at the call flow service, loading at least one dialplan into a memory accessible to the call flow service, and accessing the at least one dialplan, wherein the dialplan is selected based, at least in part, by the number called; and processing the call using the at least one dialplan.