Index: channels/chan_pjsip.c
===================================================================
--- channels/chan_pjsip.c	(revision 430609)
+++ channels/chan_pjsip.c	(working copy)
@@ -2024,6 +2024,24 @@
 		return 0;
 	}
 
+	if (session->inv_session->state >= PJSIP_INV_STATE_CONFIRMED) {
+		/* Weird case. We've received a reinvite but we don't have a channel. The most
+		 * typical case for this happening is that a blind transfer fails, and so the
+		 * transferer attempts to reinvite himself back into the call. We already got
+		 * rid of that channel, and the other side of the call is unrecoverable.
+		 *
+		 * We treat this as a failure, so our best bet is to just hang this call
+		 * up and not create a new channel.
+		 */
+		pjsip_tx_data *tdata;
+		pjsip_inv_end_session(session->inv_session, 400, NULL, &tdata);
+		/* Sending a request because the inv_session code has already sent a 200 OK. We're sending
+		 * a BYE here.
+		 */
+		ast_sip_session_send_request(session, tdata);
+		return -1;
+	}
+
 	datastore = ast_sip_session_alloc_datastore(&transport_info, "transport_info");
 	if (!datastore) {
 		return -1;