A telecommunications system in which subscribers are provided with accounts against which services are billed, the system being of the type in which calls are normally billed to calling parties, wherein the system has a mode in which, before a usable voice channel is established between a caller and a callee, the callee is presented with a charging option whereby the callee may unilaterally opt to pay some or all of the cost of a particular incoming call from their subscriber account, a charging instruction being sent to a billing system associated with the subscriber account of the callee if the callee accepts the charging option and otherwise to a billing system associated with the caller.