Call authorization and billing message routing capability
Call billing and measurement methods for redirected calls
Call center management system
Call charge control and notification
Call charge management device in private branch exchange system
Call charge transferring method in PBX system
Call charging method and related network elements
Call charging method in radio telephone system and radio telepho
Call charging notification
Call control strategy for high capacity telecommunication servic
Call conversion process for a business system for a global telec
Call data collection and modification of received call distribut
Call handling method for credit and fraud management
Call management service
Call message recording for telephone systems
Call pacing method
Call pacing method
Call patterns in a communications network
Call redirection feature for relay services
Call toll processing method and call toll processing apparatus