What is needed to add full SMS (and maybe MMS) to a hosted pbx voice offering? I know some providers, like bandwidth.com and Level3, support SMS on their numbers. Then I have heard that there are some providers that can add SMS to any phone number while another carrier handles the voice side, but I am unsure who these providers are. What providers are truely wholesale providers in the SMS world? Then I assume you need a class 5 softswitch that is able to handle SMS, and distribute the messages to end clients either on their phone, app, or by email. Does anyone do this today? I know ringcentral offers business SMS on all their plans. Is MMS much harder to add the SMS?