Mjsip dtmf

I am developing a SIP enable application working with an Asterisk server. I require DTMF signaling to be out-of-band. Should I use SIP INFO to send DTMF digits to nav. an * IVR? Anyone familar with the MJSIP stack ??? I believe I begin coding with createRequest() …in the current DIALOG… to create the SIP INFO method… any java guru’s help would be GREATLY appreciated!!!