Method and apparatus for efficient transmission of bits of voice information through a mobile radio network, which transmission saves transmission capacities and which makes it possible to mix-in announcements or to mix the bits of speech information of a number of callers during a conference call, is enabled such that its of voice information, dependent on the event, are converted in the mobile radio network into a transcoded format, are further processed, are converted into a non-transcoded format and are transmitted in a non-transcoded format.