Mine!

[default]
exten => _0XXXXXXXXX,1,Answer
exten => _0XXXXXXXXX,2,Wait(1)
exten => _0XXXXXXXXX,3,Background(say-ivr-options)

exten => 1,1,Dial(SIP/123,,t)
exten => 1,102,Voicemail(123)

exten => 2,1,Dial(SIP/103,,t)
exten => 2,102,Voicemail(103)

exten => t,1,Goto(_0XXXXXXXXX,3)
exten => i,1,Goto(_0XXXXXXXXX,3)