RTP Read too short

[quote][Jul 18 17:50:49] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:49] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[Jul 18 17:50:50] WARNING[17956]: rtp.c:1147 ast_rtp_read: RTP Read too short
[/quote]

I get wallops of these every now and again.
What is causing this, and should I be worried?