asterisk users - Mar 2008 - Way to hangup a call between two asterisk machines

I am using a call file with a channel like:
Channel: SIP/machine1_to_machine2/1042

for example. This is between two asterisk boxes.
When this is done machine1 does not show anything for "core show
channels".
however machine 2 does show the channel as being active.

How can I keep the call showing on machine 1 in "core show channels"
so
when I need to kill or hangup the call I can.

Eveything is working in my testing, I just need to call to show up on 
machine 1
so I can hangup the call when I need to... probably through an agi.

Jerry