COM AT+CHUP: terminate call 
COM
COM Used variables:
COM <DA4> Destination address of own conventional phone
COM
COM Version History:
COM Version 1.0   24.11.2003   R. Weiden	started, with adaption for model C62
COM Version 1.1   09.12.2003   R. Weiden        adapted to R65 platform, several improvements
COM -------------------------------------------------------------------------------------------------------------

COM Terminate call
AT+CHUP=?
WAIT FOR OK
ATD <DA4>;
WAIT FOR OK
MESSAGE Please answer call, then press ok. Call will be terminated...
AT+CHUP
WAIT FOR OK
COM check incoming call
MESSAGE Please call your mobile but don't answer. Press OK when mobile is ringing. Call will be cancelled.
AT+CHUP
WAIT FOR OK
MESSAGE Please hang up phone...
COM Try to write stupid values...
AT+CHUP=5
WAIT FOR ERROR
COM read command
AT+CHUP?
WAIT FOR ERROR
