diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index 954660c..687fe09 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -284,9 +284,6 @@
     [SND_DEVICE_OUT_HDMI] = "hdmi",
     [SND_DEVICE_OUT_SPEAKER_AND_HDMI] = "speaker-and-hdmi",
     [SND_DEVICE_OUT_BT_SCO] = "bt-sco-headset",
-    [SND_DEVICE_OUT_VOICE_TTY_FULL_HEADPHONES] = "voice-tty-full-headphones",
-    [SND_DEVICE_OUT_VOICE_TTY_VCO_HEADPHONES] = "voice-tty-vco-headphones",
-    [SND_DEVICE_OUT_VOICE_TTY_HCO_HANDSET] = "voice-tty-hco-handset",
 
     /* Capture sound devices */
     [SND_DEVICE_IN_EARPIECE_MIC] = "earpiece-mic",
@@ -302,9 +299,6 @@
     [SND_DEVICE_IN_CAMCORDER_MIC] = "camcorder-mic",
     [SND_DEVICE_IN_VOICE_DMIC_1] = "voice-dmic-1",
     [SND_DEVICE_IN_VOICE_SPEAKER_DMIC_1] = "voice-speaker-dmic-1",
-    [SND_DEVICE_IN_VOICE_TTY_FULL_HEADSET_MIC] = "voice-tty-full-headset-mic",
-    [SND_DEVICE_IN_VOICE_TTY_VCO_HANDSET_MIC] = "voice-tty-vco-handset-mic",
-    [SND_DEVICE_IN_VOICE_TTY_HCO_HEADSET_MIC] = "voice-tty-hco-headset-mic",
     [SND_DEVICE_IN_VOICE_REC_HEADSET_MIC] = "voice-rec-headset-mic",
     [SND_DEVICE_IN_VOICE_REC_MIC] = "voice-rec-mic",
     [SND_DEVICE_IN_VOICE_REC_DMIC_1] = "voice-rec-dmic-1",
@@ -495,14 +489,7 @@
     if (mode == AUDIO_MODE_IN_CALL) {
         if (devices & AUDIO_DEVICE_OUT_WIRED_HEADPHONE ||
             devices & AUDIO_DEVICE_OUT_WIRED_HEADSET) {
-            if (adev->tty_mode == TTY_MODE_FULL)
-                snd_device = SND_DEVICE_OUT_VOICE_TTY_FULL_HEADPHONES;
-            else if (adev->tty_mode == TTY_MODE_VCO)
-                snd_device = SND_DEVICE_OUT_VOICE_TTY_VCO_HEADPHONES;
-            else if (adev->tty_mode == TTY_MODE_HCO)
-                snd_device = SND_DEVICE_OUT_VOICE_TTY_HCO_HANDSET;
-            else
-                snd_device = SND_DEVICE_OUT_VOICE_HEADPHONES;
+            snd_device = SND_DEVICE_OUT_VOICE_HEADPHONES;
         } else if (devices & AUDIO_DEVICE_OUT_ALL_SCO) {
             snd_device = SND_DEVICE_OUT_BT_SCO;
         } else if (devices & AUDIO_DEVICE_OUT_SPEAKER) {
@@ -583,25 +570,7 @@
             ALOGE("%s: No output device set for voice call", __func__);
             goto exit;
         }
-        if (adev->tty_mode != TTY_MODE_OFF) {
-            if (out_device & AUDIO_DEVICE_OUT_WIRED_HEADPHONE ||
-                out_device & AUDIO_DEVICE_OUT_WIRED_HEADSET) {
-                switch (adev->tty_mode) {
-                case TTY_MODE_FULL:
-                    snd_device = SND_DEVICE_IN_VOICE_TTY_FULL_HEADSET_MIC;
-                    break;
-                case TTY_MODE_VCO:
-                    snd_device = SND_DEVICE_IN_VOICE_TTY_VCO_HANDSET_MIC;
-                    break;
-                case TTY_MODE_HCO:
-                    snd_device = SND_DEVICE_IN_VOICE_TTY_HCO_HEADSET_MIC;
-                    break;
-                default:
-                    ALOGE("%s: Invalid TTY mode (%#x)", __func__, adev->tty_mode);
-                }
-                goto exit;
-            }
-        }
+
         if (out_device & AUDIO_DEVICE_OUT_EARPIECE ||
                 out_device & AUDIO_DEVICE_OUT_WIRED_HEADPHONE) {
             snd_device = SND_DEVICE_IN_EARPIECE_MIC;
@@ -3786,29 +3755,6 @@
     ALOGV("%s: enter: %s", __func__, kvpairs);
 
     parms = str_parms_create_str(kvpairs);
-    ret = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_TTY_MODE, value, sizeof(value));
-    if (ret >= 0) {
-        int tty_mode;
-
-        if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_OFF) == 0)
-            tty_mode = TTY_MODE_OFF;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_VCO) == 0)
-            tty_mode = TTY_MODE_VCO;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_HCO) == 0)
-            tty_mode = TTY_MODE_HCO;
-        else if (strcmp(value, AUDIO_PARAMETER_VALUE_TTY_FULL) == 0)
-            tty_mode = TTY_MODE_FULL;
-        else
-            return -EINVAL;
-
-        pthread_mutex_lock(&adev->lock);
-        if (tty_mode != adev->tty_mode) {
-            adev->tty_mode = tty_mode;
-            if (adev->in_call)
-                select_devices(adev, USECASE_VOICE_CALL);
-        }
-        pthread_mutex_unlock(&adev->lock);
-    }
 
     ret = str_parms_get_str(parms, AUDIO_PARAMETER_KEY_BT_NREC, value, sizeof(value));
     if (ret >= 0) {
@@ -4199,7 +4145,6 @@
     adev->active_input = NULL;
     adev->primary_output = NULL;
     adev->voice_volume = 1.0f;
-    adev->tty_mode = TTY_MODE_OFF;
     adev->bluetooth_nrec = true;
     adev->in_call = false;
     /* adev->cur_hdmi_channels = 0;  by calloc() */
diff --git a/audio/audio_hw.h b/audio/audio_hw.h
index 2f1282c..ec1d2ca 100644
--- a/audio/audio_hw.h
+++ b/audio/audio_hw.h
@@ -53,11 +53,6 @@
 #define SOUND_TRIGGER_HAL_LIBRARY_PATH "/system/lib/hw/sound_trigger.primary.flounder.so"
 #endif
 
-#define TTY_MODE_OFF    1
-#define TTY_MODE_FULL   2
-#define TTY_MODE_VCO    4
-#define TTY_MODE_HCO    8
-
 #define DUALMIC_CONFIG_NONE 0
 #define DUALMIC_CONFIG_1 1
 
@@ -81,9 +76,6 @@
     SND_DEVICE_OUT_HDMI,
     SND_DEVICE_OUT_SPEAKER_AND_HDMI,
     SND_DEVICE_OUT_BT_SCO,
-    SND_DEVICE_OUT_VOICE_TTY_FULL_HEADPHONES,
-    SND_DEVICE_OUT_VOICE_TTY_VCO_HEADPHONES,
-    SND_DEVICE_OUT_VOICE_TTY_HCO_HANDSET,
     SND_DEVICE_OUT_END,
 
     /*
@@ -105,9 +97,6 @@
     SND_DEVICE_IN_CAMCORDER_MIC,
     SND_DEVICE_IN_VOICE_DMIC_1,
     SND_DEVICE_IN_VOICE_SPEAKER_DMIC_1,
-    SND_DEVICE_IN_VOICE_TTY_FULL_HEADSET_MIC,
-    SND_DEVICE_IN_VOICE_TTY_VCO_HANDSET_MIC,
-    SND_DEVICE_IN_VOICE_TTY_HCO_HEADSET_MIC,
     SND_DEVICE_IN_VOICE_REC_HEADSET_MIC,
     SND_DEVICE_IN_VOICE_REC_MIC,
     SND_DEVICE_IN_VOICE_REC_DMIC_1,
@@ -397,7 +386,6 @@
     int                     in_call;
     float                   voice_volume;
     bool                    mic_mute;
-    int                     tty_mode;
     bool                    bluetooth_nrec;
     bool                    screen_off;
     int*                    snd_dev_ref_cnt;