A voice service implementation method, wherein the method comprises: interacting, by a central node of an optical network, with a voice device and a remote node separately, and performing access control for the remote node, to establish a voice channel (S 201); and performing, by the central node of the optical network, voice encoding processing on a first digital voice signal sent by the remote node, to obtain first voice data, and sending the first voice data to the voice device by using the voice channel; or performing, by the central node of the optical network, voice decoding processing on second voice data sent by the voice device, to obtain a second digital voice signal, and sending the second digital voice signal to the remote node by using the voice channel, wherein the interacting, by the central node of the optical network, with the voice device and the remote node separately, and performing access control for the remote node comprises: receiving, by the central node of the optical network, a first digital control signal sent by the remote node, wherein the first digital control signal is obtained by the remote node according to a first analog control signal that is sent by a terminal connected to the remote node (S 606); detecting, by the central node of the optical network, the first digital control signal, to obtain a second digital control signal of the terminal connected to the remote node (S 607); and sending, by the central node of the optical network, the second digital control signal to the remote node, so that the remote node obtains a second analog control signal according to the second digital control signal, and performs access control for the terminal according to the second analog control signal (S 608). interacting, by a central node of an optical network, with a voice device and a remote node separately, and performing access control for the remote node, to establish a voice channel (S 201); and performing, by the central node of the optical network, voice encoding processing on a first digital voice signal sent by the remote node, to obtain first voice data, and sending the first voice data to the voice device by using the voice channel; or performing, by the central node of the optical network, voice decoding processing on second voice data sent by the voice device, to obtain a second digital voice signal, and sending the second digital voice signal to the remote node by using the voice channel, wherein the interacting, by the central node of the optical network, with the voice device and the remote node separately, and performing access control for the remote node comprises: receiving, by the central node of the optical network, a first digital control signal sent by the remote node, wherein the first digital control signal is obtained by the remote node according to a first analog control signal that is sent by a terminal connected to the remote node (S 606); detecting, by the central node of the optical network, the first digital control signal, to obtain a second digital control signal of the terminal connected to the remote node (S 607); and sending, by the central node of the optical network, the second digital control signal to the remote node, so that the remote node obtains a second analog control signal according to the second digital control signal, and performs access control for the terminal according to the second analog control signal (S 608). receiving, by the central node of the optical network, a first digital control signal sent by the remote node, wherein the first digital control signal is obtained by the remote node according to a first analog control signal that is sent by a terminal connected to the remote node (S 606); detecting, by the central node of the optical network, the first digital control signal, to obtain a second digital control signal of the terminal connected to the remote node (S 607); and sending, by the central node of the optical network, the second digital control signal to the remote node, so that the remote node obtains a second analog control signal according to the second digital control signal, and performs access control for the terminal according to the second analog control signal (S 608).