Does anyone have any documentation or information on how to create the XML file for a new SMS broker?

We are going to implement SMS for my customer has CIC 2017R1. They want to use the "Message Media" SMS broker. In the SMS configuration container in Administrator, in the drop down list for brokers there is no "Message Media" broker. The SMS Technical Reference says to contact ININ/Genesys Professional Services Organization for help in creating the XML File that puts a new broker in that IA drop down list.

I looked at some of the other XML files there for brokers that are in the drop down list, doesn't look too complicated. But wondered if anyone else had any info on this so I don't have to go to PSO or hack with too much trial and error.