At least one communication equipment connected to a communication infrastructure uses a first data coding format different from a second format used within the infrastructure which further comprises at least one data transcoder for converting data coded to the first format into data coded to the second format and vice versa. A transcoder is provided in the infrastructure in the vicinity of the connection to each of the equipments using the first format. The method of transmitting data between at least two of the equipments determines, on the basis of the data format used by each of the equipments between which data is to be transmitted, whether it is necessary to use a transcoder to transmit said data. If so, the transcoder nearest the equipment using the first format is activated so that the data is conveyed in a form coded to the second format in the infrastructure and changes from the first format to the second format or vice versa as close as possible to the equipment using the first format.