Various method and apparatus are provided to perform call routing, queuing and other call processing in packet telephony networks. In one embodiment, an automatic call distributor (ACD) system to perform call processing for packet telephony calls may include a call control proxy subsystem coupled to an ACD application. The call control proxy subsystem may be arranged to handle call control for packet telephony calls on behalf of one or more other subsystems or endpoints. The ACD application may control or coordinate call processing for packet telephony calls.