  Recently it has been argued that the phantom thin-shell wormholes matched
with the Schwarzschild space-time near the Schwarzschild radius ring like
Schwarzschild black holes at early times, but differently at late times
(arXiv:1602.07309). Here we consider perturbations of the wormhole which was
constructed without thin-shells: the Bronnikov-Ellis wormhole supported by the
phantom matter and electromagnetic field. This wormhole solution is known to be
stable under specific equation of state of the phantom matter. We show that if
one does not use the above thin-shell matching, the wormhole, depending on the
values of its parameters, either rings as the black hole at all times or rings
differently also at all times. The wormhole's spectrum, investigated here,
posses a number of distinctive features.
  In the final part we have considered general properties of scattering around
arbitrary rotating traversable wormholes. We have found that symmetric and
non-symmetric (with respect to the throat) wormholes are qualitatively
different in this respect: First, superradiance is allowed only if for those
non-symmetric wormholes for which the asymptotic values of the rotation
parameters are different on both sides from the throat. Second, the symmetric
wormholes cannot mimic effectively the ringing of a black hole at a few various
dominant multipoles at the same time, so that the future observations of
various events should easily tell the symmetric wormhole from a black hole.
