Device, method, medium and computer program product for voice data transmission. The device includes a processor that executes instructions in memory to: establish a call connection for voice data transmission with another device, wherein the said device parses and identifies the number of the said another device to determine whether the voice data transmission is associated with an international call, and when the voice data transmission is determined to be associated with an international call, the determine hop limit value for the voice data transmission as a first value greater than the default hop limit value; or when the voice data transmission is determined to not be associated with an international call, the hop limit value for the voice data transmission is determined as the default value; and generate packets for sending voice data based on the hop limit value determined when the call connection is established.