Configure SMS in cloud infrastructure


we are wanting to start sending SMS reminders to some of our clients to submit claims etc. I can see how to configure a gateway for On-Premise. Is this doable for cloud and if it is can someone point me in the right direction please?

The only possible problem I can see is if the gateway wants a fixed IP the requests are coming from (which in the cloud is difficult). Otherwise there's no difference between on-premise or cloud.