Advanced call waiting processing

Advanced conference drop

Advanced intelligent network access by customer premise equipmen

Advanced intelligent network with intelligent peripherals interf

Advanced intelligent signal telephone number routing

Advanced intelligent signal telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advanced intelligent single telephone number routing

Advertising system for callers to busy numbers

Ain based call retry and enhanced call waiting services

AIN call queuing

AIN triggers to invoke non-AIN features

Alerting user engaged in a first communications session on a fir

Alternate service activation

ANI based routing