  We discuss a model for the description of subbarrier fusion of heavy ions
which takes into account the coupling to the low-energy surface vibrational
states and to the few-nucleon transfer with arbitrary reaction Q-value. The
fusion reactions ^{28,30}Si+^{58,62,64}Ni, ^{40}Ca+^{90,96}Zr,
^{28}S+^{94,100}Mo, ^{16,18,20,22,24}O+^{58}Ni and
^{28}Si+^{124,126,128,130,132}Sn are analyzed in detail. The model describes
rather well the experimental fusion cross section and mean angular momentum for
reactions between nuclei near the \beta-stability line. It is shown that these
quantities are significantly enhanced by few-nucleon transfer with large
positive Q-value. A shape independent parameterization of the heavy ion
potential at distances smaller then the touching point is proposed.
