Skype for Business allows you to link to an external SNMP discovery tool, as documented here: https://technet.microsoft.com/en-us/library/gg412972.aspx
Where can I get the interface definition (WSDL, XSD, swagger or whatever) that defines what messages can be sent by the SfB server, and what responses are expected?
In case anyone else needs this information, the specification document is available on Microsoft's site here https://msdn.microsoft.com/en-us/library/ff595797(v=office.12).aspx
In case you encounter broken links, the name of the specification is "[MS-E911WS]: Web Service for E911 Support Protocol"