Hello All, I have impleamented Pjsua2 and it is working in wifi .I have implemented only registration and calling part .It is alos working in 3G but in some device may be network provider blocking calls or some thing happens that I am not able to call specially in IDEA 3G .Where as some other apps are working on same device . I have tried by changing port at this line *sipTpConfig.setPort(SIP_PORT); * from 6000 to 5060 .Also I tried with changing clock rates but dint worked . Also I have created transpot PJSIP_TRANSPORT_UDP,PJSIP_TRANSPORT_TCP , PJSIP_TRANSPORT_TLS . Please tell me what can be the reason or areas where I should debug . -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20140416/f43c196a/attachment.html>