Incomplete call notification
Information input/output controller for telephone lines
Inhibiting completion of defrauding calls
Instant calling card provisioning system
Integrated revenue domain for telecommunication networks
Intelligent call connection service
Intelligent configuration server
Intelligent configuration server
Intelligent configuration server for PBX
Intelligent network having service control node and service swit
Intelligent network system
Intelligent networked, automated telephone calling card...
Intelligent queuing of transaction records
Intelligent routing of special service telephone traffic
Intelligent-networked telecommunication system which...
Inter-exchange carrier access
Interactive and information data services telephone billing syst
Interactive and information data services telephone billing syst
Interactive billing control system
Interactive handling of disputes