asterisk users - May 2006 - Call Transfer Disconnect (CT-5)

Hi,

  Anyone has experience in using Call Transfer Disconnect (CT-5) over a 
PRI with Asterisk ?

  Call Transfer Disconnect allows you to transfer a call to a third 
party and disconnect yourself from the communication and also freeing 
your PRI channels.

  Here is a document that explains how it works:
       http://www.callamericacom.com/pdf/ctd_instructions.pdf

  My question is how can I do this with Asterisk, especially with a 
softphone (currently using SJPhone).


Andre Courchesne