Systems, computer-readable storage media, and methods are disclosed for providing wireless voice communication transmissions between a mobile unit and at least one base station. An illustrative method may comprise receiving an access request from a mobile unit. Based on information extracted form the access request and protocols for selecting a communication channel, identifying a selected communication channel for transmissions between the mobile unit and the base station. In the event of congestion or poor RF quality on the selected communication channel, where multiple communication channels associated with a home network are available at a base station, the mobile unit will attempt to access an alternate communication channel before going to a roaming network.