RTCP SR transmission error rtcp halted Invalid argument

[Jun 9 23:41:13] ERROR[13245] res_rtp_asterisk.c: RTCP SR transmission error to xx.xxx.x.xx:0, rtcp halted Invalid argument

How can I stop this error?

Linux version 2.6.18-194.11.4.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Sep 21 05:04:09 EDT 2010
CentOS release 5.5 (Final)

Look at the sip set debug on output to see if anything the other side sending, in the SDP, might cause port 0 to be selected for RTCP. Also check for any explicit RTCP settings in your configuration files.

If that doesn’t indicate a problem, update to Asterisk 1.8.22, as there have been many bug fixes since then, and see if the problem is still there.

Thank you for reply.
maybe CTI send to wrong port…
I will try it.