diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index a8ebb937..496c1c9f 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -133,6 +133,8 @@ class Account(val accp: Long) {
 
         if (dtmfMode == Api.DTMFMODE_SIP_INFO)
             res += ";dtmfmode=info"
+        else if (dtmfMode == Api.DTMFMODE_AUTO)
+            res += ";dtmfmode=auto"
 
         res = if (vmUri == "")
             "$res;mwi=no"
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
index e5918bc8..41f5a667 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
@@ -200,19 +200,18 @@ class AccountActivity : AppCompatActivity() {
                                         else
                                             Api.REL100_DISABLED
                                 "dtmf-mode" ->
-                                    if (text in arrayOf("rtp-event", "sip-info")) {
-                                        acc.dtmfMode = if (text == "rtp-event")
-                                            Api.DTMFMODE_RTP_EVENT
-                                        else
-                                            Api.DTMFMODE_SIP_INFO
-                                    }
+                                    if (text in arrayOf("rtp-event", "sip-info", "auto"))
+                                        acc.dtmfMode = when (text) {
+                                            "rtp-event" -> Api.DTMFMODE_RTP_EVENT
+                                            "sip-info" -> Api.DTMFMODE_SIP_INFO
+                                            else -> Api.DTMFMODE_AUTO
+                                        }
                                 "answer-mode" ->
-                                    if (text in arrayOf("manual", "auto")) {
+                                    if (text in arrayOf("manual", "auto"))
                                         acc.answerMode = if (text == "manual")
                                             Api.ANSWERMODE_MANUAL
                                         else
                                             Api.ANSWERMODE_AUTO
-                                    }
                                 "redirect-mode" ->
                                     acc.autoRedirect = text == "yes"
                                 "voicemail-uri" ->
@@ -317,8 +316,8 @@ class AccountActivity : AppCompatActivity() {
         rel100Check.isChecked = acc.rel100Mode == Api.REL100_ENABLED
 
         dtmfMode = acc.dtmfMode
-        val dtmfModeKeys = arrayListOf(Api.DTMFMODE_RTP_EVENT, Api.DTMFMODE_SIP_INFO)
-        val dtmfModeVals = arrayListOf(getString(R.string.dtmf_inband), getString(R.string.dtmf_info))
+        val dtmfModeKeys = arrayListOf(Api.DTMFMODE_RTP_EVENT, Api.DTMFMODE_SIP_INFO, Api.DTMFMODE_AUTO)
+        val dtmfModeVals = arrayListOf(getString(R.string.dtmf_inband), getString(R.string.dtmf_info), getString(R.string.dtmf_auto))
         keyIx = dtmfModeKeys.indexOf(acc.dtmfMode)
         keyVal = dtmfModeVals.elementAt(keyIx)
         dtmfModeKeys.removeAt(keyIx)
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Api.kt b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
index 5207af16..1ecb36c0 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Api.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Api.kt
@@ -8,6 +8,7 @@ object Api {
     const val ANSWERMODE_AUTO = 2
     const val DTMFMODE_RTP_EVENT = 0
     const val DTMFMODE_SIP_INFO = 1
+    const val DTMFMODE_AUTO = 2
     const val REL100_DISABLED = 0
     const val REL100_ENABLED = 1
     // const cal REL100_REQUIRED = 2
diff --git a/app/src/main/res/values-fi/strings.xml b/app/src/main/res/values-fi/strings.xml
index aa406820..bb2ea516 100644
--- a/app/src/main/res/values-fi/strings.xml
+++ b/app/src/main/res/values-fi/strings.xml
@@ -185,8 +185,9 @@
         tukemisesta (RFC 3262).</string>
     <string name="dtmf_mode">DTMF-moodi</string>
     <string name="dtmf_mode_help">Valitsee tavan, miten DTMF-merkit 0–9, #, * ja A-D lähetetään.</string>
-    <string name="dtmf_inband">RTP</string>
-    <string name="dtmf_info">SIP INFO</string>
+    <string name="dtmf_inband">RTP-tapahtuma</string>
+    <string name="dtmf_info">SIP INFO -pyyntö</string>
+    <string name="dtmf_auto">RTP tai SIP INFO</string>
     <string name="answer_mode">Vastaustapa</string>
     <string name="answer_mode_help">Valitsee tulevien puheluiden vastaustavan.</string>
     <string name="manual">Manuaalinen</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9318f600..cfdb3a22 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -176,6 +176,7 @@
     <string name="dtmf_mode_help">Selects how DTMF tones 0–9, #, *, and A-D are sent.</string>
     <string name="dtmf_inband">In-band RTP Events</string>
     <string name="dtmf_info">SIP INFO Requests</string>
+    <string name="dtmf_auto">In-band RTP or SIP INFO</string>
     <string name="answer_mode">Answer Mode</string>
     <string name="answer_mode_help">Selects how incoming calls are answered.</string>
     <string name="redirect_mode">Redirect Mode</string>