Conference Video Call System
A company need to create a local conference video call system to facilitate the communication between its employees across the world. The requirements are:
·  The admin shall be able to add new users to the system.
·  The admin shall be able to remove users from the system.
·  The user shall have a contact-list containing other users.
·  The user shall be able to add other users to his contact list.
·  The user shall be able to schedule a conference video call.
·  The user shall be able to invite other users from his contact list to his conference video call. 
·  The user shall be able to accept/reject a conference video call 
·  The user shall be able to join conference video call that they were invited to.
·  The user shall be able to send chat messages in the conference video call chat.
·  The system shall notify the user when an accepted conference video call time is close.
·  The system shall notify the user when another user accepts/rejects their invite.
Assignment1: Design a block diagram for the system.
Assignment2: Design a Database schema for the system. 
Note: assume any missing requirement

Please write it as doc and make it simple design. 
This is not coding assignment , just thinking written in design.

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