The notifications for the call being joined come back via Redis LIST as, you will use BRPOP or RPOP to retrieve these
URL
#Old method: Deprecated
GET http://serverurl/call.php?agent=1000&callee=0000000000&outbound_id=0123456789&call_ref=AbC123
#Restful
POST http://serverurl/click2dial/calls
agent: <ext>agent extension/number
callee:<callee> number to dial
outbound_id:<outbound_id> number to use as caller ID