A client simulator for simulating client behavior in groups or individuals to telephone services in a test system for testing telephone services between subscribers in a PSTN and clients in a distributed information network, for example, the Internet (IP Network), prior to availability of the telephone...http://www.google.com/patents/US6421424?utm_source=gb-gplus-sharePatent US6421424 - Client simulator and method of operation for testing PSTN-to-IP network telephone services for individual & group internet clients prior to availability of the services
