Call routing apparatus

Call routing determination based on a class of service...

Call routing in a wireless telecommunications system

Call routing method for a radiotelephone in multiple...

Call routing system for a wireless data device

Call routing to wireless roamers in mobile telecommunication sys

Call routing using direct in-dialing numbers in place of...

Call screening in wireless systems

Call security system

Call security system

Call security system which detects fraud by examination of...

Call set-up control with automatic recall if busy subscriber

Call set-up for fixed wireless communications system

Call set-up in mobile communications system

Call set-up method in radio communication system

Call set-up on 800 MHz analog voice channel from 1900 MHZ digita

Call set-up process

Call setup in mobile systems

Call state control function (CSCF) call processing

Call storage in removable memory