A method for transmitting a short message provided with a group identifier to a group of participants of an active group voice call by means of mobile terminals via a mobile radio network, in particular according to the GSM or UMTS standard, wherein - the mobile radio network comprises at least - a base station system (30, 66), - an anchor mobile switching centre, and - a mobile switching centre (54, 90), - a voice channel is assigned to the group, via which voice channel respectively only one group participant can actively speak or send information on request of this voice channel, - the other group participants passively receive this information as listeners via a downlink channel reserved for the group voice call, - a mobile subscriber transmits a short message to the group of listeners of the group voice call, wherein the short message is sent using a group identifier and it indicates that it is of the message type multicast, - the group identifier is assigned to the short message by the sender of the short message, which is evaluated in the mobile radio network in the anchor mobile switching centre allocated to the sender, - a forwarding unit of the mobile switching centre transmits, apart from the short message, an indicator to the anchor mobile switching centre, which indicator indicates that the short message is of the type multicast, wherein messages of the type multicast are transmitted to a plurality of participants, - the short message is transmitted corresponding to the group identifier to the group participants via the involved anchor mobile switching centre and mobile switching centres (54, 90) and base station systems (30, 66), - the sender of the short message does not belong to the group of participants of the active group voice call, and - the transmission of the short message to the group of participants of the group voice call is realized via the mobile switching centre that is relevant for the sender and afterwards directly via the anchor switching centre allocated to the group and via the downlink channel reserved for the group voice call while excluding any short message service centre. - the mobile radio network comprises at least - a base station system (30, 66), - an anchor mobile switching centre, and - a mobile switching centre (54, 90), - a base station system (30, 66), - an anchor mobile switching centre, and - a mobile switching centre (54, 90), - a voice channel is assigned to the group, via which voice channel respectively only one group participant can actively speak or send information on request of this voice channel, - the other group participants passively receive this information as listeners via a downlink channel reserved for the group voice call, - a mobile subscriber transmits a short message to the group of listeners of the group voice call, wherein the short message is sent using a group identifier and it indicates that it is of the message type multicast, - the group identifier is assigned to the short message by the sender of the short message, which is evaluated in the mobile radio network in the anchor mobile switching centre allocated to the sender, - a forwarding unit of the mobile switching centre transmits, apart from the short message, an indicator to the anchor mobile switching centre, which indicator indicates that the short message is of the type multicast, wherein messages of the type multicast are transmitted to a plurality of participants, - the short message is transmitted corresponding to the group identifier to the group participants via the involved anchor mobile switching centre and mobile switching centres (54, 90) and base station systems (30, 66), - the sender of the short message does not belong to the group of participants of the active group voice call, and - the transmission of the short message to the group of participants of the group voice call is realized via the mobile switching centre that is relevant for the sender and afterwards directly via the anchor switching centre allocated to the group and via the downlink channel reserved for the group voice call while excluding any short message service centre.