AgentCallbackLogin( ) Enables agent login with callback
AgentCallbackLogin([AgentNo][,[options][exten]@context])
Allows a call agent identified by AgentNo to log into the call queue system, to be called back when a call comes in for that agent.
When a call comes in for the agent, Asterisk calls the specified exten (with an optional context).
The options argument may contain the letter s, which causes the login to be silent.
; silently log in as agent number 42, and have Asterisk
; call SIP/400 when a call comes in for this agent
exten => 123,1,AgentCallbackLogin(42,s,SIP/400)