A method and apparatus for identifying the class of an operator assistance call in order to reduce the operator work time for serving such a call. A customer dials 0 or dials 0 plus a directory number and is connected to a program controlled operator assistance system or switch. The switch initially...http://www.google.de/patents/US4797910?utm_source=gb-gplus-sharePatent US4797910 - Automated operator assistance calls with voice processing
