Some embodiments relate to a method of authorizing the establishment of a peer-to-peer stream between two user terminals of a mobile telecommunications network. The method is implemented in a platform of the mobile telecommunications network and comprises receiving, from a server of a peer-to-peer service provider, a request to establish a peer-to-peer stream between a first user terminal and a second user terminal, the establishment request including a stream identifier, the stream identifier including at least an identifier of the first user terminal and an identifier of the second user terminal. The method also comprises deciding whether to authorize the establishment of the peer-to-peer stream between the first user terminal and the second user terminal and sending an authorization or rejection message for the peer-to-peer stream to a network gateway in charge of controlling the streams transiting on the mobile telecommunications network, the message including the stream identifier.