Please answer this correctly, thank you.

Draw a UML sequence diagram that specifies the following protocol of initiating a two-party phone call. Let us assume that there are four objects involved:

two Callers (s and r),

an unnamed telephone Switch, and

Conversation (c) between the two parties.

The sequence begins with one Caller (s) sending a message (liftReceiver) to the Switch object. In turn, the Switch calls setDialTone on the Caller, and the Caller iterates (7 times) on the message dialDigit to itself. The Switch object then calls itself with the message routeCall. It then creates a Conversation object (c), to which it delegates the rest of the work. The Conversation object (c) rings the Caller (r), who asynchronously sends the message liftReceiver. The Conversation object then tells both Caller objects to connect, after which they talk. Once Caller (r) sends a disconnect message to Conversation then Conversation tells both Caller objects to disconnect and also it tells the Switch to disconnect. After that Switch deletes the object Conversation.