A workload balancing technique enhances balancing of workloads processed by components of a telephone communication system configured to render telephony services over a computer network. The telephony services illustratively include private branch exchange (PBX) services suitable for customers with geographically dispersed telephone service demands. The workload balancing technique is invoked by the communication system to reduce contention among the components of the system, such as telephone access servers (TASes) coupled to a proxy router, when servicing telephony requests issued by the customers, thus enabling rendering of the telephony services in an efficient and cost-effective manner. As described herein, an available TAS is randomly selected to service a telephony request received by the proxy router from a network coupled to the communication system.