I want to develop a java application that can send MMS from PC to handphone. I found out that I can use MMS Java Library from Nokia to compose the MMS and send it using WAP stack. Now, I am using jWAP as the WAP stack. But I am a bit confused about the headers and the sending part.

I understand that the step to send mms is:

PC -> connect to GPRS -> connect to WAP gateway -> connect to MMSC, post the file and the rest we leave it for the MMSC to send the MMS to the handphone.

I am able to connect to GPRS and WAP gateway but I can not connect to MMSC eventhough I use the URL given by my local provider.
Can somebody help me in explaining wat is the header and how to send the MMS file? Wat is the MMS file extension? .mms or .smil?
can provide me with some kind of url or sample code? Thank you in advance.