asterisk users - Feb 2006 - Detecting Agents and Chanspy

Is it possible to detect if a specific agent is on a call?  I can check 
${AGENTBYCALLERID_${AGENTID}} to see if they are logged in(ie if set they are), 
but I want to be able to detect if they are actually on a call.  The 
ChanIsAvail() doesn't seem to work for Agent channels.  I want to do this
from
within the dialplan.

Also it is possible to alter the format that ChanSpy() records in?  It seems to 
be hard coded to .raw (and lame/sox don't seem to like it for conversion).


--johann