Method and apparatus for establishing multicast groups

The invention includes a method and apparatus for dynamically establishing a multicast group. The method comprises a plurality of parameters adapted for establishing the multicast group, the request to establish the multicast group, the method comprising: receiving from a first user device, the method comprising: obtaining a multicast address for the multicast group and , by using a multicast address is assigned to the parameter comprises the step of establishing a multicast group. This parameter must contain at least one multicast group definition parameters and at least one multicast session description parameters. At least a portion of the multicast address and the parameters are configured such that the second user device is provided to the second user device to be able to dynamically join the multicast group.