A communication apparatus through which voice communication can be performed, including: a line interface portion which receives and transmits data form and to a line and which includes a data access arrangement device in which is incorporated a detection circuit that detects at least one of a line voltage...http://www.google.fr/patents/US8023640?utm_source=gb-gplus-shareBrevet US8023640 - Communication apparatus capable of adjusting volume of voice to be reproduced
Communication apparatus capable of adjusting volume of voice to be reproduced
