Index: channels/chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.540
diff -u -r1.540 chan_sip.c
--- channels/chan_sip.c	22 Oct 2004 13:18:20 -0000	1.540
+++ channels/chan_sip.c	22 Oct 2004 13:22:51 -0000
@@ -6824,9 +6824,14 @@
 				if (!p->owner)
 					p->needdestroy = 1;
 			} else if ((resp >= 100) && (resp < 200)) {
-				/* Unknown 1xx repsonses should be treated as 100 */
 				if (!strcasecmp(msg, "INVITE")) {
 					sip_cancel_destroy(p);
+					if (!ast_strlen_zero(get_header(req, "Content-Type")))
+						process_sdp(p, req);
+					if (p->owner) {
+						/* Queue a progress frame */
+						ast_queue_control(p->owner, AST_CONTROL_PROGRESS);
+					}
 				}
 			} else
 				ast_log(LOG_NOTICE, "Dunno anything about a %d %s response from %s\n", resp, rest, p->owner ? p->owner->name : ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr));