Receive SMS Messages?

I have seen a lot of posts about sending SMS messages to mobile phones from the OpenFire server, but I have the opposite need. I need to support mobile phone users with devices that are not able to run one of the available clients. I would like to have them set up to send an SMS message to a number, which then sends that message to a group of users on our OpenFire server. If anyone has any ideas on how to accomplish this I would greatly appreciate some guidance.

Dan