This invention relates to arrangements for providing a new spontaneous voice message service to any telephone customer at any telephone station when that customer encounters any destination that is busy or that does not answer. When a customer having a dual tone multifrequency (DTMF) station calls any...http://www.google.co.uk/patents/US4932042?utm_source=gb-gplus-sharePatent US4932042 - Spontaneous voice and data messaging
