Multiuser multimedia messaging service.

A method of efficient transmission of a multimedia message from a sending device (100) of user receiving devices (103, 204, 20n) user, the method comprising the steps of - sending a first message from the sending device (100) user to an issuer server (101), the first message comprising the multimedia message and an indication of addresses of the receiving devices (103, 204, 20n) user, - identifying a recipient server (102) associated with the receiving devices (103 , 204, 20n) of user based on the indication of the addresses, - sending the first message to the recipient server (102), - identifying the receiving devices (103, 204, 20n) user based on the indication of the addresses, characterized by - executing a multicast delivery of the multimedia message to the receiving devices (103, 204, 20n) user assigning a multicast address, sending the multicast address to receiving devices (103, 204, 20n) user, include the multimedia message in an object suitable for a multicast transmission, preparing the receiving devices (103, 204, 20n) user for receiving the object, collect the receiving devices (103, 204, 20n) user in a multicast group according to the multicast address, and sending the object via the multicast transmission to the receiving devices (103, 204, 20n) user.