I am trying to perform a call between a Pocket PC 2003 iPAQ hx6340 and a Windows Mobile 5.0 iPAQ hx2790. I am using the correct SDKs while building the application for each device. The application window pops up on both devices. 1. When I try to call from the Pocket PC , "Calling" appears but nothing appears in the Windows Mobile PJSIP application window 2. When I try to call from the Windows Mobile, the connection is established, the call lasts about 4 seconds, then the application exits abruptly on it. ________________________________________ Samer M. Faour Computer and Communications Engineering American University of Beirut P.O. Box 11-0236/ 1461 Riad el Solh Square 1107 - 2020 Email: smf18 at aub.edu.lb ----------------------------------------------------------------