Hi Ranjit
You can use different TCL script to do so.
One script you can use is bacd script.
This script lets you play welcome prompt, then send it to different queue. But instead, you can configure it such a way that, it plays the ringback wave file as welcome prompt, then autometically send call to a queue number, which will be dial-peer destination pattern pointing to you IVR
Also, you can use AA tcl script. This one also playes welcome and ask for extention. But with simple modification, you can send the call to your IVR after playing the ringback as welcome prompt.
All these scripts you can download from CCO and look for documenation.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/bacd/configuration/guide/40bacd.html
Hope this helps
thanks
- abu