Thanks Steve!, Mustafa, those few words from both of you were really transparent and special. I appreciate it. @Mustafa: Never mind, just personal comment ========= 1. I spend 3 years to make my j2ME code works for SIP got failed, audio codec's killed me 2. I spend more time to use OS SIP got failed 3. I spend more time to use pjSIP got failed (segmentation fault), and there supports are really dead 4. I spend more time to find Alchemy+Flex sdk to make SIP user agent cross platform. ========================================================================== Sub total: 4 hard time Total amount to pay: 6 year (PAID, got nothing) I am sorry, i have to use Skype client (skype4com/skypeKit) this time, because the SIP user agent client is not for junior programmers, there is strongly no cross platform (web/mobile/desktop) solid release available yet. Many thanks for sharing. I know at least now, what i can do to forward my project. Cheers