From 52435978d0187e59af503dd263946c735dd97c3d Mon Sep 17 00:00:00 2001
From: Steve Underwood <steveu@coppice.org>
Date: Thu, 17 Jul 2014 22:32:17 +0800
Subject: [PATCH] Step FAX modem type on sending CTC.

---
 libs/spandsp/src/t30.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libs/spandsp/src/t30.c b/libs/spandsp/src/t30.c
index 304a0aa570..f601ad5583 100644
--- a/libs/spandsp/src/t30.c
+++ b/libs/spandsp/src/t30.c
@@ -3133,8 +3133,9 @@ static void process_rx_ppr(t30_state_t *s, const uint8_t *msg, int len)
         /* Continue to correct? */
         /* Continue only if we have been making progress */
         s->ppr_count = 0;
-        if (s->ecm_progress)
+        if (s->ecm_progress  &&  fallback_sequence[s->current_fallback + 1].bit_rate)
         {
+            s->current_fallback++;
             s->ecm_progress = 0;
             queue_phase(s, T30_PHASE_D_TX);
             set_state(s, T30_STATE_IV_CTC);