A method of operating a wireless communication system to serve media conferencing to User Equipment, UE, that stores a secret key, the method comprising: a wireless network core of a wireless network transferring UE information to a user authorization server that stores the secret key; the user authorization server generating an expected result based on a random number and the secret key in response to the UE information and transferring the expected result and the random number to the wireless network core ; the wireless network core transferring the random number to the UE via a wireless access point (111 - 113), receiving an authentication result from the UE via the wireless access point (111 - 113), and authenticating the UE by matching the authentication result to the expected result; and the wireless network core exchanging media conferencing data for the UE , the method characterized by : the wireless network core , in response to the wireless network authentication, transferring the expected result to a media conferencing server , and establishing a signaling link between the UE and the media conferencing server ; and the media conferencing server receiving the authentication result from the UE over the signaling link, registering the UE by matching the authentication result to the expected result, and establishing media conferences for the UE based on the media conferencing registration. a wireless network core of a wireless network transferring UE information to a user authorization server that stores the secret key; the user authorization server generating an expected result based on a random number and the secret key in response to the UE information and transferring the expected result and the random number to the wireless network core ; the wireless network core transferring the random number to the UE via a wireless access point (111 - 113), receiving an authentication result from the UE via the wireless access point (111 - 113), and authenticating the UE by matching the authentication result to the expected result; and the wireless network core exchanging media conferencing data for the UE , the method characterized by : the wireless network core , in response to the wireless network authentication, transferring the expected result to a media conferencing server , and establishing a signaling link between the UE and the media conferencing server ; and the media conferencing server receiving the authentication result from the UE over the signaling link, registering the UE by matching the authentication result to the expected result, and establishing media conferences for the UE based on the media conferencing registration. the wireless network core , in response to the wireless network authentication, transferring the expected result to a media conferencing server , and establishing a signaling link between the UE and the media conferencing server ; and the media conferencing server receiving the authentication result from the UE over the signaling link, registering the UE by matching the authentication result to the expected result, and establishing media conferences for the UE based on the media conferencing registration. <EOS>