18.104.22.168.3 Context Handle Generation
If a server stub needs to create a context handle and the activity of the call has a NULL CAS UUID, the server SHOULD generate a conv_who_are_you2 conversation callback to determine the correct CAS UUID. If the conversation callback fails, the stub SHOULD raise an exception with the status code of the conversation callback. The CAS UUID is used to find the CAS in the Table of Client Address Spaces. The context handle is added to the CAS Context Handle List for the CAS.