diff -u -r1.677 chan_sip.c
--- chan_sip.c	17 Mar 2005 23:03:07 -0000	1.677
+++ chan_sip.c	19 Mar 2005 17:54:25 -0000
@@ -5285,7 +5287,6 @@
 				ast_log(LOG_NOTICE, "Peer '%s' is trying to register, but not configured as host=dynamic\n", peer->name);
 			} else {
 				ast_copy_flags(p, peer, SIP_NAT);
-				transmit_response(p, "100 Trying", req);
 				if (!(res = check_auth(p, req, p->randdata, sizeof(p->randdata), peer->name, peer->secret, peer->md5secret, SIP_REGISTER, uri, 0, ignore))) {
 					sip_cancel_destroy(p);
 					if (parse_contact(p, peer, req)) {