Data transmission method via a member device of a group call

Procedure emission data through a device (106; 107; 108; 109; 110) a member of a group call, the device having the function of issuer in the group call, then issuing the device at least vocal information, in which: - the vocal information is obtained by applying a first codec (202) on a sound message (201), characterized in that - the vocal information is multiplexed with data nonvocal to issue in order to form a frame (T) data, - the data frame is emitted as if the result of the coding of the sound message by a second codec, the velocity of the second higher than the speed of the first codec codec, - it is attributed frame identifier (iDT) to non-voice data to issue, - the non-voice data transmitted using the frame identifier reconstituted.