Does the GHI Cellular Radio Module TCP stack support UDP over PPP?

Am currently testing the Cellular Radio Module connected to FEZ Spider II… NETMF 4.3 Gadgeteer libraries
My attempts to use either NTPTime via this PPP connection or my handwritten SNTPClient both fail with socket error 10050.
My question is how can I find out what level/functionality of TCP stack is implemented or supported by the GHI Cellular Radio libraries?
Any document or references would be most welcome.
Basically all I need to do is connect to a UDP port 123 via the GSM/gprs network

@ marinehero - UDP should work. Can you post a small but complete example that we can try?