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There are lots and lots of traps you can fall into when talking about encryption of data. I don't have a clue what a SIP phone is but assuming that your program is Java based then you need to do a lot of background reading. A good starting point is "Beginning Cryptography with Java" by David Hook published by Wrox.
thanks for your reply and advice.
I am sorry i didn't describe to you clearly what is "sip phone".It is a Java based program, just like skype, it's a IP phone,and use sip(Session Initiation Protocol) to build a session.
lee wrote:It kind of depends on how you're sending the data out, doesn't it?
we want to encrypt the data before send them out
What is doing the actual physical transfer of data out of your system?