  We present neutron scattering measurements on low-energy phonons from a
superconducting ($T_{c} = 2.7$~K) Sn$_{0.8}$In$_{0.2}$Te single crystal sample.
The longitudinal acoustic phonon mode and one transverse acoustic branch have
been mapped out around the (002) Bragg peak for temperatures of 1.7 K and 4.2
K. We observe a substantial energy width of the transverse phonons at energies
comparable to twice the superconducting gap; however, there is no change in
this width between the superconducting and normal states. We also confirm that
the compound is well ordered, with no indications of structural instability.
