Asterisk + vlc

hi all,
I want to use my sip client to see a video file with asterisk using VLC as streaming server. when I start the call with my client, in the CLI i got this message

[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:419 GetUdpPorts: -GetUdpPorts [39254,47309]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:441 GetUdpPorts: -GetUdpPorts [47309,47310]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:441 GetUdpPorts: -GetUdpPorts [47310,47311]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:419 GetUdpPorts: -GetUdpPorts [58234,40818]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:441 GetUdpPorts: -GetUdpPorts [40818,40819]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:743 RtspPlayerDescribe: >DESCRIBE [/sample_h264_100kbit.mp4]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:775 RtspPlayerDescribe: <DESCRIBE [/sample_h264_100kbit.mp4]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:1432 rtsp_play: -rtsp play loop [0]
[Apr 19 18:14:46] NOTICE[8684]: channel.c:3168 __ast_read: Dropping incompatible voice frame on SIP/1001-00000005 of format alaw since our native format has changed to 0x4 (ulaw)
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:1511 rtsp_play: -Receiving describe
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:1519 rtsp_play: -Describe response code [200]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:1511 rtsp_play: -Receiving describe
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:1519 rtsp_play: -Describe response code [2147483647]
[Apr 19 18:14:46] DEBUG[8684]: app_rtsp.c:2034 rtsp_play: -rtsp_play end loop [0]

i don’t kwon what wrong someone can explain me the problem and help me to fix it?

There are no error messages.