Hi, We have downloaded the PjSIP 1.5 code and built it for windows mobile. We are currently working on SIPEK mobile application( http://sites.google.com/site/sipekvoip/sipek-mobile) We are trying to build the latest dll using PjSIP 1.5 stack and SIPEKmobile code. It is getting built properly and we are able to make a call from WM handset to X-lite on desktop. But somehow we are not able to receive a call made from X-lite to our handset. Debugging the application showed the problem in the following code in pjsua_call.c in pjsua_call_on_state_changed() method. call = (pjsua_call*) inv->dlg->mod_data[pjsua_var.mod.id]; if (!call) { PJSUA_UNLOCK(); return; } Here we receiive the Call as NULL and the code is returned from here. For incoming call(INVITE Session)the pjsua_var.mod.id is set to 6. The session is sameone that is created and one that is passed to this method. Strange thing is that there is already a built in dll(the one that we are trying to build) using PJSIP stack version 0.3.110. it is available at SIPEK site - http://code.google.com/p/sipeksdk/downloads/detail?name=pjsipDll_mobile.dll_v0.3_110 . If we use this dll then everything works fine and we are able to receive a call. Any idea on the above issue will really help us as its urgent as we are working on this issue for quite a long time now but not getting any idea as why this is happening. Thanks, Sangram -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20091211/9b9fecc4/attachment.html>