Hi Emil. Had a similar problem. As far as I know ActiveSync does not support UDP packets, so it was impossible to debug directly on the device. So I used wifi connection. The next problem was that pjsip defaulted with the ActiveSync IP, so I added the 169.*.*:* filter in the code. Now it works just fine. If you use emulator then you have to setup the virtual networking. Instructions are here: http://msdn.microsoft.com/en-us/netframework/cc952340.aspx Regards, Tine Emil Berg wrote: > Hello, > > Does somebody know whether pjsua_wince can work on a Windows Mobile > device connected to the internet through ActiveSync. > When I tried to make registration to the server, it failed. > I opened Wireshark on my computer to see the traffic, and I could see > that a SIP registration message was sent to the server through the > computer, the server responded, > but then the SIP traffic stopped. Maybe the computer doesn't transfer > messages back to the mobile device for some reason? > > I'll be glad if someone can help me. Maybe there are some settings on > the mobile/computer that I need to change. > > Thanks, > Emil.