uwicjamie

I am using is Windows Mobile 6 device connected over a Wi-Fi network using WPA-PSK. I am connecting to a Shoretel VoIP system. If initiate the call I can hear them they can't hear me but if they initiate the call to me everything works fine. After they have called me if I then call them back everything is then fine. If I connect to the same Wi-Fi network on my laptop everything works first time. Does this point to a problem with the windows mobile device? A different client on an apple Iphone works fine first time. Any comments very much appreciated. Jamie