A telephone system and method of operation are disclosed which use a microprocessor control system (10), a speech generator (34) and speech memory (46) to interact with a calling party placing a long distance phone call. The telephone establishes a communication path through a telephone line interface...http://www.google.fr/patents/US4920562?utm_source=gb-gplus-shareBrevet US4920562 - Automatic generation of billing records at a telephone paystation
Automatic generation of billing records at a telephone paystation
