Section from queues.conf

[general]
persistentmembers = yes

[Operators]
; simple queue for operators
strategy = ringall
timeout = 15
retry=2
wrapuptime=2
member => SIP/p601_8a7b,1 ;Bonny
member => SIP/p601_c086,1 ;Becky
member => SIP/p601_c3ce,1 ;Geraldine
member => SIP/p601_eed3,2 ;Kerry Lofton
member => SIP/p601_c213,2 ;Jean
member => SIP/p601_ee99,2 ;Peggy

CLI
pbx1*CLI> show queue Operators
Operators    has 0 calls (max unlimited) in 'ringall' strategy (2s holdtime), W:0, C:106, A:0, SL:0.9% within 0s
   Members:
      SIP/p601_8a7b with penalty 1 (dynamic) (Not in use) has taken 20 calls (last was 54480 secs
      SIP/p601_ee99 with penalty 2 (Not in use) has taken no calls yet
      SIP/p601_c213 with penalty 2 (Not in use) has taken no calls yet
      SIP/p601_eed3 with penalty 2 (Not in use) has taken no calls yet
      SIP/p601_c3ce with penalty 1 (In use) has taken 10 calls (last was 55211 secs ago)
      SIP/p601_c086 with penalty 1 (Not in use) has taken 23 calls (last was 55077 secs ago)

extensions.conf entry 

exten=>s,n,Queue(Operators,tr)