How can I route certain MMS (e.g. those with attachment of certain kind of files) from a mobile operator to NowSMS, and then re-route that MMS back to the operator? Please advise on which protocol/method is best for such purpose and whether/how NowSMS is able to support. Thanks
I'm sorry, but I don't understand what you're asking.
It sounds like you want to intercept messages from the operator MMSC ... I don't know how that could be done without cooperation from the operator (and the operator would also need special software to do this).