)
self._set_callback_label(number)
else:
+ if number.startswith("1747"): number = "+" + number
self._backend.set_callback_number(number)
assert make_ugly(number) == make_ugly(self._backend.get_callback_number()), "Callback number should be %s but instead is %s" % (
make_pretty(number), make_pretty(self._backend.get_callback_number())