Hello,
Chanspy will start monitoring the channel specified as the 1st parameter, as a prefix. FOP2 will use the complete channel name, like SIP/100. So, there is no way for chanspy to monitor SIP/200 if you started it that way, but you have the posibility of star to spy SIP/1000 or sip/1001. I have not tried myself on the exact behaviour on chanspy, and I am not sure if there is an option to end the call when the monitoring channel terminates. At least not in Asterisk 1.4, perhaps there is an option in 1.6? The next release will have the option to pass options to chanspy, so you can limit monitoring for the spygroup variable, or any other chanspy option available.
Best regards,