How to use skype SDK to join meetings with URI provided by the user

 I have some queries regarding the functionalities provided by the Skype SDK 

1) Is it possible for my application to join a meeting url(provided to me by a client) as an attendee(bot)?

2) Is there a way to get all participants for that particular call?

3) Does skype sdk send events when a new participant joins the call?

4) Does the skype SDK send audio change events during a meeting?

5) What sdk should be used for the above use cases? I see Skype web SDK, UCMA and Trusted web application API in the documentation. What are the differences between these and what should be suitable for the above use cases?