On Alice's machine, refresh the web browser to see that both Alice and Bob are registered.
Click Call next to Bob's SIP address to place a call to Bob.
In X-Lite click Answer to place the call to Bob.
X-Lite will initiate a call to Bob's X-Lite instance using Communications Server as a proxy.
On Bob's machine, click Answer to receive the call from Alice.
Alice and Bob are now connected and may talk.