An improvement in the transparency of personal telecommunications over the prior art is achieved by automatically placing a return call from a personal communications unit of a called individual in response to a call from a caller and alerting the called individual to the existence of the call placed...http://www.google.fr/patents/US5884167?utm_source=gb-gplus-shareBrevet US5884167 - Method for completing a conference with a personal communications units
Method for completing a conference with a personal communications units
