Two-part apparatus and method for protecting coin-operated telep
Two-pass directory entry device and method
Two-step algorithm for training an echo cancellation filter
Two-step algorithm for training an echo cancellation filter
Two-telephone intercom
Two-tiered authorization and authentication for a cable data...
Two-way communication over a single transmission line...
Two-way communication system with selective muting
Two-way communications earset
Two-way communications earset
Two-way communications earset
Two-way communications earset with filter
Two-way radio communication system with max-minimum call assignm
Two-way voice & digital data analyzer for telephones
Two-way voice and voice over IP receivers for alarm systems
Two-way voice communication methods and apparatus
Two-way voice messaging terminal having a speech to text convert
Two-way wireless messaging system having user agent
Two-way wireless messaging system with transaction server
Two-wire channel unit with loopback test capability