Need some clarification, and there are some caveats you may need to consider:
 
- Are you attempting to automate a Jabber client?  If so, is it Jabber for Windows/MAC or perhaps iPhone/Android?
- Are you attempting to automate a custom application created using the Jabber SDK?
- Are you using UCXSI to attempt to automate Jabber?
To my knowledge:
- UCXSI supports automating only SCCP protocol endpoints, not SIP.  Jabber (client or SDK) is implemented via SIP and may not be supported by UCXSI
- UCXSI does not include commands for creating conference calls
If you are trying to do something more specific, please give us more details...