Cellular mobile telephony
We developed a system to manage the following use cases.
A mobile user sends a SMS or MMS to an eMail address. The system converts the SMS or MMS format in a valid eMail format. Append to that eMail some additional information and sends the eMail to an SMPT Server.
The addressee of the eMail could send an reply. The system converts that replay in a valid SMS or MMS format and forward it to the mobile user. All further replays will be discarded by the system.