how to stop to intrude call silently

[brightel]

hi,I developed a contact center application using avaya IC sdk. i want to intrude call silently,but i can't find the method in avaya IC sdk.. So i use the following code:
dn="*27"+dn;
makecall(dn,AddressBookDestinationType.AGENT,uui);
I can intrude call silently,but i can't stop to intrude.
So the question is:how to stop intrude?
Thank you very much!

[brightel]

if i want to release the call, is there any function code, just like "*27".
i have no idea, can anyone help me? thank you very much.

[brightel]

i want to intrude the call,and stop to intruding the call ,how can i do this?
Thank you very much