exten => 310XXXXXXX,1,DIAL(SIP/2001,30)
exten => 310XXXXXXX,2,DIAL(SIP/2002,30)
exten => 310XXXXXXX,3,DIAL(SIP/2003,30)
exten => 310XXXXXXX,4,DIAL(SIP/2004,30)
exten => 310XXXXXXX,5,Hungup