- The Jabber SDK is a JavaScript+browser-addon based solution
- As such, it's not really amenable to a .NET native app integration
- CUCM provides TAPI and JTAPI as the CTI interfaces for monitoring/control of CUCM phones (including Jabber):
https://developer.cisco.com/site/tapi/index.gsp
https://developer.cisco.com/site/jtapi/index.gsp
Note: as TAPI/JTAPI can monitor multiple devices at large scale, and involves installing/maintaining components/libraries on the client, you may want to consider creating a TAPI/JTAPI based service that monitors multiple devices and provides its own RPC notification mechanism to individual clients.