Reg chanspy configuration

hi all, please anyone help me, how to configure the chanspy application in asterisk 1.4 .0 beta version.
i need two functionalities.

  1. using whisper mode i want to speak one of the 2 parties of the bridged call.
  2. and only listening on the these two parties.

i’m struggle with this configuration, please answer how can i configure it.

regards,
thi