I've been using GSM modems in my projects to send/recieve SMS-s. I have been using built-in serial port communication features of .net to do this by using standard AT commands.
Now I have to extend its functionality (like SMSs in PDU mode, more efficient delivery report handling etc). I don't wanna reinvent the wheel, so first I'd like to know if there is a good open source project or a free library on this topic. It should send/recieve sms in text and pdu mode, handle delivery reports.
I've googled it, but I have not found an efficient one so far.
Platform: Windows/.net4/vs2010/c#
Since, you are not looking for just a client library, you need to deploy your own SMS gateway. This is what you need