OK here is a possible tricky one.
 
I have a rocom door entry system which connects to an FXS port on my TDM400P card.  When the door button is pressed it initiates an 's' extension which dials a number of SIP extensions.  When a SIP phone is picked up the user can speak to the person at the door and press the 7 digit which sends at DTMF tone to the rocom unit opening the door.  All this works fine with my Grandstream 101 phones.
 
However, to end the call the user must then press the '3' button to tell the rocom unit to hangup the call.  If the user doesn't press the 3 button and just hangs up the phone, the rocom unit sounds the "beep beep beep" sound when the other party has cleared.  Of course there is no way of hanging up the rocom unit.  There is a good chance that the 3 key will not be pressed by some of the users.
 
So, my question to all you genius asterisk guys out there is, can anyone think of a way of generating a '3' DTMF tone automatically when you hang up the grandstream phone, thus telling the rocom unit to end the call ??
 
I did create a custom Playtones item to generate the 3 DTMF tone and added lines to my extensions.conf file as follows :
 
[door]
exten => s,1,Dial (SIP31,15)
exten => s,2,Playtones(dtmf)
 
However the call hangsup before trying to play the DTMF tone.
 
Any ideas ??  I do here of people complaining that there are too many easy questions on the list so perhaps this will tax your brains :-)
 
Thanks
Nigel
 
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