diff -Naur asterisk-81430.orig/channels/chan_sip.c asterisk-81430.patched-infofix/channels/chan_sip.c
--- asterisk-81430.orig/channels/chan_sip.c	2007-09-03 11:10:53.000000000 +0700
+++ asterisk-81430.patched-infofix/channels/chan_sip.c	2007-09-03 13:02:32.000000000 +0700
@@ -12183,7 +12183,11 @@
 		ast_debug(1, "Got a Request to Record the channel, state %s\n", c);
 		transmit_response(p, "200 OK", req);
 		return;
-	}
+	} else if (!strcasecmp(get_header(req, "Content-Length"), "0")) { 
+		/* Nothing in the header is interesting, now check if content-length is 0 (RFC2976) */	
+		transmit_response(p, "200 OK", req); 
+		return; 
+       }
 	/* Other type of INFO message, not really understood by Asterisk */
 	/* if (get_msg_text(buf, sizeof(buf), req)) { */