--- asterisk-1.8.0-beta1-orig/res/res_srtp.c	2010-07-20 21:35:02.000000000 +0200
+++ asterisk-1.8.0-beta1/res/res_srtp.c	2010-07-25 15:02:50.353081700 +0200
@@ -304,6 +304,7 @@
 
 	if (res != err_status_ok && res != err_status_replay_fail ) {
 		ast_debug(1, "SRTP unprotect: %s\n", srtp_errstr(res));
+		errno = EAGAIN;
 		return -1;
 	}