=== extensions.conf ===

[ext]
exten => 2590,1,AgentCallbackLogin(||@ext)
exten => 2505,1,Answer
exten => 2505,2,Queue(support)

=== agents.conf === 

[agents]
agent => 2525,1234,Agent 1
agent => 2544,1234,Agent 2
agent => 2545,1234,Agent 3

=== queues.conf ===

[support]
memberdelay = 2
announce-holdtime = yes
announce-frequency = 90
musiconhold=default
strategy = ringall
reportholdtime = yes
member => Agent/2525
member => Agent/2544
member => Agent/2545