05636265 is referenced by 32 patents and cites 16 patents.

A mobile telephone operated from a vehicle battery comprises an input line for providing a signal indicative of the ignition stage of the vehicle. The telephone has a menu facility for selecting an automatic answer mode. The telephone goes off-hook automatically after a predetermined interval if the automatic answer mode has been selected and the signal on input line (11) indicates that the ignition is turned on. An incoming call can thus be answered without the user having to physically touch the telephone. On the other hand the automatic answer mode is not enabled when the ignition is off, i.e when the telephone is more likely to be unattended.

Title
Radio telephone with automatic answering
Application Number
7/872021
Publication Number
5636265
Application Date
April 22, 1992
Publication Date
June 3, 1997
Inventor
Michael Overy
Medstead
GB
Donal O Connell
Camberley
GB
Agent
Perman & Green
Assignee
Nokia Mobile Phones
GB
IPC
H04B 1/16
H04B 1/04
H04B 7/00
H04M 11/00
View Original Source