diff -uNr asterisk-1.6.2.0-rc3-orig/main/rtp.c asterisk-1.6.2.0-rc3/main/rtp.c
--- asterisk-1.6.2.0-rc3-orig/main/rtp.c	2009-10-16 19:45:44.000000000 +0200
+++ asterisk-1.6.2.0-rc3/main/rtp.c	2009-10-16 19:50:43.000000000 +0200
@@ -1291,6 +1291,8 @@
 	}
 
 	if (g_srtp_res && rtp->srtp && g_srtp_res->unprotect(rtp->srtp, buf, &len) < 0) {
+		/* just a workaround - not a solution */
+		errno = EAGAIN;
 		return -1;
 	}