ixi-UMS Business offer SMS dispatch using several providers. To use these services, you must be registered with one of the providers listed who will invoice you for this service.
Fees may vary depending on the provider.
With some providers you have to have a static IP in order to use the service.
Simply compare the various providers and pick out the most favourable one for you. The service User account has to be activated so that a user is able to use the SMS text message dispatch.
Depending on the provider, you can also provide the reply address in the request.
In principle, every service provider can be connected if it has a HTTP GET or POST interface.