diff --git a/pjsip/src/pjsip/sip_transaction.c b/pjsip/src/pjsip/sip_transaction.c
index 084402268..6595cb23a 100644
--- a/pjsip/src/pjsip/sip_transaction.c
+++ b/pjsip/src/pjsip/sip_transaction.c
@@ -1972,9 +1972,14 @@ static void send_msg_callback( pjsip_send_state *send_state,
 	    if (tsx->state != PJSIP_TSX_STATE_TERMINATED &&
 		tsx->state != PJSIP_TSX_STATE_DESTROYED)
 	    {
-		tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED, 
-			       PJSIP_EVENT_TRANSPORT_ERROR,
-			       send_state->tdata, 0);
+	    	pj_time_val delay = {0, 0};
+
+		/* Post the event for later processing, to avoid deadlock. */
+		lock_timer(tsx);
+	    	tsx_cancel_timer(tsx, &tsx->timeout_timer);
+	    	tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay,
+			           TRANSPORT_ERR_TIMER);
+		unlock_timer(tsx);
 	    } 
 	    /* Don't forget to destroy if we have pending destroy flag
 	     * (http://trac.pjsip.org/repos/ticket/906)