Index: modules/dialog/dlg_handlers.c
===================================================================
--- modules/dialog/dlg_handlers.c	(revision 6366)
+++ modules/dialog/dlg_handlers.c	(working copy)
@@ -681,7 +681,10 @@
 	}
 
 	if (parse_from_header(req)<0 || get_from(req)->tag_value.len==0) {
-		LM_ERR("failed to get From header\n");
+		LM_ERR("failed to get From header (hdr=%p,parsed=%p,tag_len=%d) "
+			"callid=<%.*s>\n", req->from, req->from?req->from->parsed:NULL,
+			req->from?(req->from->parsed?get_from(req)->tag_value.len:0):0,
+			req->callid->body.len, req->callid->body.s);
 		return -1;
 	}