H323-ivr-out sending extra attribute from Cisco TCL to radius

Hello all I am using a cisco IP IP gw. I wish to send some extra attributes from Cisco and Radius both. I read about an attribute h323-ivr-out and h323-ivr-in. I tried using it but was unsuccesful to do so. If anyone can help me out with the use of h323 ivr out in TCL I would be very thankful. Do I have to define this attribute somewhere in the dictionary file. Vignesh