Caller-controller barge-in telephone service
Method and apparatus for an automatic barge-in system
Method and apparatus for seizing a trunk circuit in a telecommun
Method and arrangement for the connection of multiple terminals
Method for interrupting a telephone call after receiving a busy
Method for interrupting a telephone call after receiving a...
Phone line supervisory controls
Phone line supervisory controls
Subscriber control of busy line interrupt and line treatment...
System and method for automated emergency call breakthrough
System for processing incoming calls based on call priority...
System for providing prioritized connections in a public switche