diff --git a/libs/spandsp/tests/dtmf_rx_tests.c b/libs/spandsp/tests/dtmf_rx_tests.c
index e160bbf4ef..bd0d81e083 100644
--- a/libs/spandsp/tests/dtmf_rx_tests.c
+++ b/libs/spandsp/tests/dtmf_rx_tests.c
@@ -154,8 +154,8 @@ int callback_ok;
 int callback_roll;
 int step;
 
-int max_forward_twist;
-int max_reverse_twist;
+float max_forward_twist;
+float max_reverse_twist;
 
 int use_dialtone_filter = FALSE;
 
@@ -325,8 +325,8 @@ static void mitel_cm7291_side_1_tests(void)
     logging_state_t *logging;
 
     dtmf_state = dtmf_rx_init(NULL, NULL, NULL);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -635,8 +635,8 @@ static void mitel_cm7291_side_2_and_bellcore_tests(void)
     logging_state_t *logging;
 
     dtmf_state = dtmf_rx_init(NULL, NULL, NULL);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -706,8 +706,8 @@ static void dial_tone_tolerance_tests(void)
     logging_state_t *logging;
 
     dtmf_state = dtmf_rx_init(NULL, NULL, NULL);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -763,8 +763,8 @@ static void callback_function_tests(void)
     callback_ok = TRUE;
     callback_roll = 0;
     dtmf_state = dtmf_rx_init(NULL, digit_delivery, (void *) 0x12345678);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -793,8 +793,8 @@ static void callback_function_tests(void)
     callback_roll = 0;
     dtmf_rx_init(dtmf_state, NULL, NULL);
     dtmf_rx_set_realtime_callback(dtmf_state, digit_status, (void *) 0x12345678);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -836,8 +836,8 @@ static void decode_test(const char *test_file)
     logging_state_t *logging;
 
     dtmf_state = dtmf_rx_init(NULL, NULL, NULL);
-    if (use_dialtone_filter  ||  max_forward_twist >= 0  ||  max_reverse_twist >= 0)
-        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99);
+    if (use_dialtone_filter  ||  max_forward_twist >= 0.0f  ||  max_reverse_twist >= 0.0f)
+        dtmf_rx_parms(dtmf_state, use_dialtone_filter, max_forward_twist, max_reverse_twist, -99.0f);
     logging = dtmf_rx_get_logging_state(dtmf_state);
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
     span_log_set_tag(logging, "DTMF-rx");
@@ -874,8 +874,8 @@ int main(int argc, char *argv[])
     use_dialtone_filter = FALSE;
     channel_codec = MUNGE_CODEC_NONE;
     decode_test_file = NULL;
-    max_forward_twist = -1;
-    max_reverse_twist = -1;
+    max_forward_twist = -1.0f;
+    max_reverse_twist = -1.0f;
     while ((opt = getopt(argc, argv, "c:d:F:fR:")) != -1)
     {
         switch (opt)
@@ -887,13 +887,13 @@ int main(int argc, char *argv[])
             decode_test_file = optarg;
             break;
         case 'F':
-            max_forward_twist = atoi(optarg);
+            max_forward_twist = atof(optarg);
             break;
         case 'f':
             use_dialtone_filter = TRUE;
             break;
         case 'R':
-            max_reverse_twist = atoi(optarg);
+            max_reverse_twist = atof(optarg);
             break;
         default:
             //usage();
diff --git a/libs/spandsp/tests/fax_decode.c b/libs/spandsp/tests/fax_decode.c
index e175a6168b..4b8268cc01 100644
--- a/libs/spandsp/tests/fax_decode.c
+++ b/libs/spandsp/tests/fax_decode.c
@@ -465,7 +465,8 @@ int main(int argc, char *argv[])
     fsk_rx_state_t *fsk;
     v17_rx_state_t *v17;
     v29_rx_state_t *v29;
-    v27ter_rx_state_t *v27ter;
+    v27ter_rx_state_t *v27ter_4800;
+    v27ter_rx_state_t *v27ter_2400;
     int16_t amp[SAMPLES_PER_CHUNK];
     SNDFILE *inhandle;
     SF_INFO info;
@@ -504,11 +505,14 @@ int main(int argc, char *argv[])
     v17 = v17_rx_init(NULL, 14400, v17_put_bit, NULL);
     v29 = v29_rx_init(NULL, 9600, v29_put_bit, NULL);
     //v29 = v29_rx_init(NULL, 7200, v29_put_bit, NULL);
-    v27ter = v27ter_rx_init(NULL, 4800, v27ter_put_bit, NULL);
+    v27ter_4800 = v27ter_rx_init(NULL, 4800, v27ter_put_bit, NULL);
+    v27ter_2400 = v27ter_rx_init(NULL, 2400, v27ter_put_bit, NULL);
+
     fsk_rx_signal_cutoff(fsk, -45.5);
     v17_rx_signal_cutoff(v17, -45.5);
     v29_rx_signal_cutoff(v29, -45.5);
-    v27ter_rx_signal_cutoff(v27ter, -40.0);
+    v27ter_rx_signal_cutoff(v27ter_4800, -40.0);
+    v27ter_rx_signal_cutoff(v27ter_2400, -40.0);
 
 #if 1
     logging = v17_rx_get_logging_state(v17);
@@ -521,9 +525,14 @@ int main(int argc, char *argv[])
     span_log_set_protocol(logging, "V.29");
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
 
-    logging = v27ter_rx_get_logging_state(v27ter);
+    logging = v27ter_rx_get_logging_state(v27ter_4800);
     span_log_init(logging, SPAN_LOG_FLOW, NULL);
-    span_log_set_protocol(logging, "V.27ter");
+    span_log_set_protocol(logging, "V.27ter-4800");
+    span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
+
+    logging = v27ter_rx_get_logging_state(v27ter_2400);
+    span_log_init(logging, SPAN_LOG_FLOW, NULL);
+    span_log_set_protocol(logging, "V.27ter-2400");
     span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
 #endif
 
@@ -541,7 +550,8 @@ int main(int argc, char *argv[])
         fsk_rx(fsk, amp, len);
         v17_rx(v17, amp, len);
         v29_rx(v29, amp, len);
-        //v27ter_rx(v27ter, amp, len);
+        v27ter_rx(v27ter_4800, amp, len);
+        v27ter_rx(v27ter_2400, amp, len);
     }
     t4_rx_release(&t4_rx_state);
 
diff --git a/libs/spandsp/tests/fax_tester.c b/libs/spandsp/tests/fax_tester.c
index 544756f712..023b130751 100644
--- a/libs/spandsp/tests/fax_tester.c
+++ b/libs/spandsp/tests/fax_tester.c
@@ -86,15 +86,15 @@ static void front_end_step_complete(faxtester_state_t *s)
 
 void faxtester_send_hdlc_flags(faxtester_state_t *s, int flags)
 {
-    hdlc_tx_flags(&(s->modems.hdlc_tx), flags);
+    hdlc_tx_flags(&s->modems.hdlc_tx, flags);
 }
 /*- End of function --------------------------------------------------------*/
 
 void faxtester_send_hdlc_msg(faxtester_state_t *s, const uint8_t *msg, int len, int crc_ok)
 {
-    hdlc_tx_frame(&(s->modems.hdlc_tx), msg, len);
+    hdlc_tx_frame(&s->modems.hdlc_tx, msg, len);
     if (!crc_ok)
-        hdlc_tx_corrupt_frame(&(s->modems.hdlc_tx));
+        hdlc_tx_corrupt_frame(&s->modems.hdlc_tx);
 }
 /*- End of function --------------------------------------------------------*/
 
@@ -115,30 +115,24 @@ static void hdlc_underflow_handler(void *user_data)
             buf[2] = 0x06;
             buf[3] = s->image_ptr/s->ecm_frame_size;
             memcpy(buf + 4, &s->image_buffer[s->image_ptr], s->ecm_frame_size);
-            hdlc_tx_frame(&(s->modems.hdlc_tx), buf, 4 + s->ecm_frame_size);
+            hdlc_tx_frame(&s->modems.hdlc_tx, buf, 4 + s->ecm_frame_size);
             if (s->corrupt_crc >= 0  &&  s->corrupt_crc == s->image_ptr/s->ecm_frame_size)
-                hdlc_tx_corrupt_frame(&(s->modems.hdlc_tx));
+                hdlc_tx_corrupt_frame(&s->modems.hdlc_tx);
             s->image_ptr += s->ecm_frame_size;
             return;
         }
-        else
+        /* The actual image is over. We are sending the final RCP frames. */
+        if (s->image_bit_ptr > 2)
         {
-            /* The actual image is over. We are sending the final RCP frames. */
-            if (s->image_bit_ptr > 2)
-            {
-                s->image_bit_ptr--;
-                buf[0] = 0xFF;
-                buf[1] = 0x03;
-                buf[2] = 0x86;
-                hdlc_tx_frame(&(s->modems.hdlc_tx), buf, 3);
-                return;
-            }
-            else
-            {
-                /* All done. */
-                s->image_buffer = NULL;
-            }
+            s->image_bit_ptr--;
+            buf[0] = 0xFF;
+            buf[1] = 0x03;
+            buf[2] = 0x86;
+            hdlc_tx_frame(&s->modems.hdlc_tx, buf, 3);
+            return;
         }
+        /* All done. */
+        s->image_buffer = NULL;
     }
     front_end_step_complete(s);
 }
@@ -388,7 +382,7 @@ int faxtester_rx(faxtester_state_t *s, int16_t *amp, int len)
     int i;
 
     for (i = 0;  i < len;  i++)
-        amp[i] = dc_restore(&(s->modems.dc_restore), amp[i]);
+        amp[i] = dc_restore(&s->modems.dc_restore, amp[i]);
     s->modems.rx_handler(s->modems.rx_user_data, amp, len);
     timer_update(s, len);
     if (s->wait_for_silence)
@@ -474,10 +468,7 @@ void faxtester_set_rx_type(void *user_data, int type, int bit_rate, int short_tr
     {
     case T30_MODEM_CED:
     case T30_MODEM_CNG:
-        if (type == T30_MODEM_CED)
-            tone = MODEM_CONNECT_TONES_FAX_CED;
-        else
-            tone = MODEM_CONNECT_TONES_FAX_CNG;
+        tone = (type == T30_MODEM_CED)  ?  MODEM_CONNECT_TONES_FAX_CED  :  MODEM_CONNECT_TONES_FAX_CNG;
         modem_connect_tones_rx_init(&t->connect_rx,
                                     tone,
                                     tone_detected,
diff --git a/libs/spandsp/tests/fax_tests.sh b/libs/spandsp/tests/fax_tests.sh
index 3c78fe51a2..e273968630 100755
--- a/libs/spandsp/tests/fax_tests.sh
+++ b/libs/spandsp/tests/fax_tests.sh
@@ -18,7 +18,7 @@
 run_fax_test()
 {
     rm -f fax_tests_1.tif
-    echo ./fax_tests -i ${FILE} ${OPTS} -i ${FILE}
+    echo ./fax_tests ${OPTS} -i ${FILE}
     ./fax_tests ${OPTS} -i ${FILE} >xyzzy 2>xyzzy2
     RETVAL=$?
     if [ $RETVAL != 0 ]
@@ -142,3 +142,6 @@ do
     FILE="${ITUTESTS_DIR}/R1200_1200_A3.tif"
     run_fax_test
 done
+
+echo
+echo All fax tests successfully completed
diff --git a/libs/spandsp/tests/fax_utils.c b/libs/spandsp/tests/fax_utils.c
index bd69917ef1..063f14b331 100644
--- a/libs/spandsp/tests/fax_utils.c
+++ b/libs/spandsp/tests/fax_utils.c
@@ -91,7 +91,7 @@ void fax_log_final_transfer_statistics(t30_state_t *s, const char *tag)
     t30_get_transfer_statistics(s, &t);
     printf("%s: Bit rate %d\n", tag, t.bit_rate);
     printf("%s: ECM %s\n", tag, (t.error_correcting_mode)  ?  "on"  :  "off");
-    //printf("%s: RTP events %d. RTN events %d\n", tag, t.rtp_events, t.rtn_events);
+    printf("%s: RTP events %d. RTN events %d\n", tag, t.rtp_events, t.rtn_events);
     printf("%s: Tx pages %d, rx pages %d\n", tag, t.pages_tx, t.pages_rx);
 }
 /*- End of function --------------------------------------------------------*/
diff --git a/libs/spandsp/tests/regression_tests.sh b/libs/spandsp/tests/regression_tests.sh
index fe1e1a8ad9..f6a4fb9a10 100755
--- a/libs/spandsp/tests/regression_tests.sh
+++ b/libs/spandsp/tests/regression_tests.sh
@@ -179,31 +179,14 @@ echo dtmf_tx_tests completed OK
 #echo echo_tests completed OK
 echo echo_tests not enabled
 
-for OPTS in "-p AA" "-p AA -e" "-p TT" "-p TT -e" "-p GG" "-p GG -e" "-p TG" "-p TG -e" "-p GT" "-p GT -e"
-do
-    for FILE in ${ITUTESTS_TIF} ${MIXEDSIZES_TIF}
-    do
-        rm -f fax_tests.tif
-        ./fax_tests ${OPTS} -i ${FILE} >$STDOUT_DEST 2>$STDERR_DEST
-        RETVAL=$?
-        if [ $RETVAL != 0 ]
-        then
-            echo fax_tests ${OPTS} -i ${FILE} failed!
-            exit $RETVAL
-        fi
-        # Now use tiffcmp to check the results. It will return non-zero if any page images differ. The -t
-        # option means the normal differences in tags will be ignored.
-        tiffcmp -t ${FILE} fax_tests.tif >/dev/null
-        RETVAL=$?
-        if [ $RETVAL != 0 ]
-        then
-            echo fax_tests ${OPTS} -i ${FILE} failed!
-            exit $RETVAL
-        fi
-        echo fax_tests ${OPTS} -i ${FILE} completed OK
-    done
-done
-echo fax_tests completed OK
+./fax_tests.sh
+RETVAL=$?
+if [ $RETVAL != 0 ]
+then
+    echo fax_tests.sh failed!
+    exit $RETVAL
+fi
+echo fax_tests.sh completed OK
 
 ./fsk_tests >$STDOUT_DEST 2>$STDERR_DEST
 RETVAL=$?
@@ -536,27 +519,25 @@ echo t4_tests completed OK
 #echo t4_t6_tests completed OK
 echo t4_t6_tests not enabled
 
-#rm -f t81_t82_arith_coding_tests_receive.tif
-#./t4_tests >$STDOUT_DEST 2>$STDERR_DEST
-#RETVAL=$?
-#if [ $RETVAL != 0 ]
-#then
-#    echo t81_t82_arith_coding_tests failed!
-#    exit $RETVAL
-#fi
-#echo t81_t82_arith_coding_tests completed OK
-echo t81_t82_arith_coding_tests not enabled
+rm -f t81_t82_arith_coding_tests_receive.tif
+./t4_tests >$STDOUT_DEST 2>$STDERR_DEST
+RETVAL=$?
+if [ $RETVAL != 0 ]
+then
+    echo t81_t82_arith_coding_tests failed!
+    exit $RETVAL
+fi
+echo t81_t82_arith_coding_tests completed OK
 
-#rm -f t85_tests_receive.tif
-#./t85_tests >$STDOUT_DEST 2>$STDERR_DEST
-#RETVAL=$?
-#if [ $RETVAL != 0 ]
-#then
-#    echo t85_tests failed!
-#    exit $RETVAL
-#fi
-#echo t85_tests completed OK
-echo t85_tests not enabled
+rm -f t85_tests_receive.tif
+./t85_tests >$STDOUT_DEST 2>$STDERR_DEST
+RETVAL=$?
+if [ $RETVAL != 0 ]
+then
+    echo t85_tests failed!
+    exit $RETVAL
+fi
+echo t85_tests completed OK
 
 #./time_scale_tests >$STDOUT_DEST 2>$STDERR_DEST
 #RETVAL=$?
@@ -672,10 +653,10 @@ echo v42_tests completed OK
 RETVAL=$?
 if [ $RETVAL != 0 ]
 then
-    echo v42bis_tests failed!
+    echo v42bis_tests.sh failed!
     exit $RETVAL
 fi
-echo v42bis_tests completed OK
+echo v42bis_tests.sh completed OK
 
 ./v8_tests >$STDOUT_DEST 2>$STDERR_DEST
 RETVAL=$?