Hi, After several months and nights, I succeed to port PJSIP on Nintendo DS. I can : call and receive calling without registration step, call with my SIP Provider with registration step, I don't test receive calling from my SIP Provider. I must still work on ndssound port, I have several global or static (define) variables. I note a problem in libresample. I find on internet a new version of libresample (http://www-ccrma.stanford.edu/~jos/resample/Available_Software.html), perhaps it resolves the problem. I will study this solution. Samuel