Multicasting in Linphone Android

[epsilon13]

Hi everyone
I want to have a multicast video streaming from one of my linphone-android phones. In my code I added these lines of code at the beginning of linphone_core_invite_address_with_params in linphonecore.c:
` LinphoneVideoPolicy vid_policy;

linphone_core_enable_video_capture(lc, TRUE);
linphone_core_enable_video_display(lc, TRUE);
vid_policy.automatically_initiate=TRUE;
vid_policy.automatically_accept=TRUE;

linphone_core_set_video_policy(lc, &vid_policy);
linphone_core_set_video_multicast_addr(lc,"224.1.2.3");
linphone_core_enable_video_multicast(lc,TRUE);
linphone_core_set_audio_multicast_addr(lc,"224.1.2.3");
linphone_core_enable_audio_multicast(lc,TRUE);

`
The problem is it won't make my call a multicast call. The call stays unicast and it won't use the multicast Ip address I set in above code.
Is linphone not supporting multicasting? or I am missing something or my code is not in a good place?
please tell me if I am making the mistake, how can I enable multicasting in linphone?