[Asterisk-Dev] Can I play announcement to caller and callee when I answer the ca ll?

[Tony Chan (ITApps)]

I have put in the following line in my extension.conf: 

exten=1234,1,dial(SIP/1234, rtA(hello_i_am_tony)) 

I do hear "hello_i_am_tony" wave file in my 1234 phone. Anyway to modify it
to hear on both my phone and the one who is calling in? 

Many thanks, 
Tony