Pass code security is provided for a teleconference call in an AIN-based telecommunications network. Participants to the conference call dial in to a bridge at a Service Switching Point (SSP). If a trigger is detected on the line associated with the bridge, a Service Control Point (SCP) is queried, which in turn causes an Intelligent Peripheral (IP) to generate a voice message asking the caller for a pass code. If a valid pass code is entered by the caller and received at the IP, the SSP connects the caller to the bridge.