Differential routing of voice handover traffic and non-voice handover traffic in response to congestion on an inter-base-station interface

Disclosed are methods and systems to facilitate differential routing of voice handover traffic and non-voice handover traffic. In particular, a wireless communication system may include a controller, a backhaul interface that passes through the controller, an inter-base-station interface that does not pass through the controller, as well as first and second base stations that are communicatively linked via (i) the backhaul interface and (ii) the inter-base-station interface. With this arrangement, the system may encounter a trigger to configure transmission of handover signaling between the first and second base stations, and may responsively configure itself to transmit (i) via the inter-base-station interface handover signaling that facilitates handover between the first and second base stations of ongoing voice communications and (ii) via the backhaul interface handover signaling that facilitates handover between the first and second base stations of communications other than ongoing voice communications.