Thanks Nigel, I tried commenting out PA_VALIDATE_ENDIANNESS in Pa_Initialize. Compilation was done properly and also i could run the application without any error or assertion.... but i am not able to make a call . When ever i give option m to make a call from one system to other ...It gives the following error: Dialog creation failed: Invalid URI [PJSIP_EINVALI] STATUS 171 and at the same time the other systm says : CALL 0 DISCONNECTED [REASON=500 INTERNAL SERVER ERROR] Could u please help me... Thanks Anitha Suresh --------------------------------- Never miss a thing. Make Yahoo your homepage. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080103/f9d24ef2/attachment.html