Prepaid calling with warning announcement
Prepaid long distance call system and method
Prepaid long-distance telephone service system with flexible ope
Prepaid phone card service using speech recognition
Prepaid phone service for both wired and wireless...
Prepaid phone service for both wired and wireless...
Prepaid real-time web based reporting
Prepaid services with security provisions to protect against...
Prepaid services with security provisions to protect against...
Prepaid telephone calling card with distinct PIN numbers
Prepaid telephone calling card with distinct PIN numbers
Prepaid telephone calling card with message recording...
Prepaid telephony system and method of activating a prepaid...
Pricing method for telecommunication system
Private branch exchange
Private branch exchange apparatus and accounting process method
Procedure and system for the setting up of calls
Process and system for dynamically measuring switch traffic
Process for dynamic call routing in real time
Process for flexible rate charging for existing connections