A typical multi-site trunked communication system (100) comprises communication units (110-116) that are arranged into talk groups, communication resources (106-109) distributed among communication sites, (102-105) and a communication resource allocator (101). In such a system, a methodology is incorporated that allows communication units (110-116) to override communication site busy conditions, where the communication site busy conditions prohibits placement of group calls until all communication sites (102105) have an available communication resource (106-109). The communication site busy condition may be overridden by a communication unit (110-116) by initiating a busy override signal. Once the busy override signal is initiated, the communication resource allocator (101) allocates, in each site (102-105), a communication resource (106-109) to the communication group of the requesting communication unit (110-116).