Hi,
I am not sure on how to do a handshake. I am not in control of the receiving end. there are only two options, either the person picks up the phone or not.
It is not like me programing a RS232 where I am in control of both ends. I am not sure I understand the handshaking thing.
This is the code I use for dialing, I would just like to add the receiving off hook, programing bit so I have more control over the dialing process.
(If that works then I will probably use the ISD4005 voice chip.. but I am not there yet.)

Dial1760: 'cel
lcdout $FE,1, "dialing1760 ",dec counter
Pause 500
PortA.1 = 1 'Activate relay
pause 3000
DTMFOUT PortA.0, 500, 100, [5,5,4,4,9,5,4,3,6,2] 'dialing
'Set the OnTime to 500ms and OffTime to 100ms - for sure receiving
pause 8000 'Pause 8 seconds 'wait for enduser to pick up
DTMFOUT PortA.0, 6000,0, [5] 'signal
pause 2000 'Pause 2 seconds
PortA.1 = 0 'deActivate relay
pause 5000 'Pause 5 seconds
return

K