func handler(c twilio.Context) {
o := c.IntValue("Offset")
if o < 0 || o >= len(digits) {
c.Hangup()
return
}
d := ""
if o == 0 {
d = "3 point "
}
d += digits[o]
c.Responsef(`
<Say>%v</Say>
<Redirect method="GET">http://pi-phone.appspot.com/?Offset=%v</Redirect>
`, d, o+1)
}
