[oncall]
exten => s,1,Answer
exten => s,2,Wait(2)
exten => s,3,Background(please-wait-connect-oncall-eng)
exten => s,4,Dial(IAX2/sigterm@teliax/18085277733,12)
exten => s,5,Dial(IAX2/sigterm@teliax/18085277748,12)
exten => s,6,Dial(IAX2/sigterm@teliax/18083068569,12)
exten => s,7,Voicemail(u667)
exten => s,8,Hangup