Hi everybody, I have a great news, PJSIP works on Nintendo DS. I developed simply GUI to prove the concept. I will work on the GUI later. You can download application and read instruction, look screenshots at : http://libw11.free.fr I use config file to parameterize PJSIP. I took the same format that pjsua. I need contact parameter because the automatic build of contact is bad. PJSIP get on Nintendo DS: (null)<sip:0950707520 at 192.168.0.9:5060;transport=UDP> and not <sip:0950707520 at 192.168.0.9:5060;transport=UDP> Thanks to Benny and Perry for your help. Samuel