A group routing server, communication devices, and related methods are described. The group routing server may comprise a processor operably coupled with communication elements and memory, and be configured to determine a destination communication device from among a plurality of communication devices to which an incoming call is to be routed, determine whether an assistive communication service is needed for providing interpretive services based, at least in part, on differing communication abilities between a far-end user associated with a far-end communication device initiating the incoming call and a near-end user associated with the destination communication device, route the incoming call to the assistive communication service according to the routing rules if the assistive communication device is determined to be needed, and route the incoming call directly to the communication service according to the routing rules if the assistive communication device is not determined to be needed.