diff --git a/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
index 77854448..7a570777 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
@@ -165,8 +165,8 @@ class ConfigActivity : AppCompatActivity() {
             val listenAddr = listenAddr.text.toString().trim()
             if (listenAddr != oldListenAddr) {
                 if ((listenAddr != "") && !Utils.checkIpPort(listenAddr)) {
-                    Utils.alertView(this, "Notice",
-                            "Invalid Listen Address '$listenAddr'")
+                    Utils.alertView(this, getString(R.string.notice),
+                            "${getString(R.string.invalid_listen_address)}: $listenAddr")
                     return false
                 }
                 Config.remove("sip_listen")
@@ -186,8 +186,8 @@ class ConfigActivity : AppCompatActivity() {
             val dnsServers = addMissingPorts(dnsServers.text.toString().trim().toLowerCase())
             if (dnsServers != oldDnsServers) {
                 if (!checkDnsServers(dnsServers)) {
-                    Utils.alertView(this, "Notice",
-                            "Invalid DNS Servers: $dnsServers")
+                    Utils.alertView(this, getString(R.string.notice),
+                            "${getString(R.string.invalid_dns_servers)}: $dnsServers")
                     return false
                 }
                 Config.remove("dyn_dns")
@@ -197,8 +197,8 @@ class ConfigActivity : AppCompatActivity() {
                         Config.add("dns_server", server)
                     Config.add("dyn_dns", "no")
                     if (Api.net_use_nameserver(dnsServers) != 0) {
-                        Utils.alertView(this, "Notice",
-                                "Failed to set DNS servers '$dnsServers'")
+                        Utils.alertView(this, getString(R.string.error),
+                                "${getString(R.string.failed_to_set_dns_servers)}: $dnsServers")
                         return false
                     }
                 } else {
@@ -263,8 +263,8 @@ class ConfigActivity : AppCompatActivity() {
                 if (aec.isChecked) {
                     Config.add("module", "webrtc_aec.so")
                     if (Api.module_load("webrtc_aec.so") != 0) {
-                        Utils.alertView(this, "Notice",
-                                "Failed to load Acoustic Echo Cancellation module")
+                        Utils.alertView(this, getString(R.string.error),
+                                getString(R.string.failed_to_load_aec_module))
                         return false
                     }
                 } else {
@@ -276,7 +276,8 @@ class ConfigActivity : AppCompatActivity() {
             val opusBitRate = opusBitRate.text.toString().trim()
             if (opusBitRate != oldOpusBitrate) {
                 if (!checkOpusBitRate(opusBitRate)) {
-                    Utils.alertView(this, "Notice", "Invalid Opus Bit Rate: $opusBitRate")
+                    Utils.alertView(this, getString(R.string.notice),
+                            "${getString(R.string.invalid_opus_bitrate)}: $opusBitRate.")
                     return false
                 }
                 Config.remove("opus_bitrate")
@@ -288,8 +289,8 @@ class ConfigActivity : AppCompatActivity() {
             val opusPacketLoss = opusPacketLoss.text.toString().trim()
             if (opusPacketLoss != oldOpusPacketLoss) {
                 if (!checkOpusPacketLoss(opusPacketLoss)) {
-                    Utils.alertView(this, "Notice",
-                            "Invalid Opus Packet Loss Percentage: $opusPacketLoss")
+                    Utils.alertView(this, getString(R.string.notice),
+                            "${getString(R.string.invalid_opus_packet_loss)}: $opusPacketLoss")
                     return false
                 }
                 Config.remove("opus_inbandfec")
diff --git a/app/src/main/res/values-fi/strings.xml b/app/src/main/res/values-fi/strings.xml
index 4c8d3def..0aa59043 100644
--- a/app/src/main/res/values-fi/strings.xml
+++ b/app/src/main/res/values-fi/strings.xml
@@ -175,6 +175,7 @@
     jolloin baresip kuuntelee porttia 5060 kaikilla käytössä olevilla
     osoitteilla.
     </string>
+    <string name="invalid_listen_address">Virheellinen kuunteluosoite</string>
     <string name="prefer_ipv6">Suosi IPv6-protokollaa</string>
     <string name="prefer_ipv6_help">Jos merkitty, baresip suosii
     IPv6-protokollaa, mikäli sekä IPv4 että IPv6 ovat käytettävissä.</string>
@@ -185,8 +186,11 @@
         on IPv6-osoite ja myös portti annetaan, pitää osoite kirjoittaa sulkujen [] sisään.
         Esimerkiksi luettelo \'8.8.8.8:53,[2001:4860:4860::8888]:53\' osoittaa Googlen julkisiin
         DNS-palvelijoihin.</string>
+    <string name="invalid_dns_servers">Virheelliset DNS-palvelimet</string>
+    <string name="failed_to_set_dns_servers">DNS-palvelinten asetus epäonnistui</string>
     <string name="aec">Akustinen kaiun poisto</string>
     <string name="aec_help">Jos merkitty, kaikua yritetään poistaa puheluiden aikana.</string>
+    <string name="failed_to_load_aec_module">Kaiunpoistomodulin lataaminen epäonnistui.</string>
     <string name="opus_bit_rate">Opus-koodekin bittinopeus</string>
     <string name="opus_bit_rate_help">Opus-koodekin käyttämä
     keskimääräinen enimmäisnopeus. Mahdollisia arvoja ovat
@@ -196,7 +200,8 @@
     <string name="opus_packet_loss_help">Odotettu Opus audio virran pakettihäviö prosentteina.
         Mahdolliset arvot ovat 0-100. Oletusarvo on 0, jolloin ennakoiva virheenkorjaus
         ei ole käytössä.</string>
-    <string name="_0" translatable="false">0</string>
+    <string name="invalid_opus_bitrate">Virheellinen Opus-koodekin bittinopeus</string>
+    <string name="invalid_opus_packet_loss">Virheellinen Opus-koodekin odotettu pakettihäviö</string>
     <string name="ice_lite_mode">ICE Lite-moodi</string>
     <string name="ice_lite_mode_help">Jos merkitty, ICE Lite-moodi on
     käytössä.
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6a350f51..f61372bb 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -155,6 +155,7 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
         available addresses. If left empty (factory default), baresip listens at port 5060 of
         all available addresses.
     </string>
+    <string name="invalid_listen_address">Invalid Listen Address</string>
     <string name="_0_0_0_0_5060" translatable="false">0.0.0.0:5060</string>
     <string name="prefer_ipv6">Prefer IPv6</string>
     <string name="prefer_ipv6_help">Prefer IPv6 if both IPv4 and IPv6 are available.</string>
@@ -165,6 +166,8 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
         also port is given, ip must
         be written inside brackets [].  As an example, list \'8.8.8.8:53,[2001:4860:4860::8888]:53\'
         points to IPv4 and IPv6 addresses of public Google DNS servers.</string>
+    <string name="invalid_dns_servers">Invalid DNS Servers</string>
+    <string name="failed_to_set_dns_servers">Failed to set DNS servers</string>
     <string name="tls_certificate_file">TLS Certificate File</string>
     <string name="tls_certificate_file_help">If checked, file \'cert.pem\' containing
         TLS certificate and private key of this baresip instance has been or will be loaded from
@@ -174,6 +177,7 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
         of Certificate Authorities has been or will be loaded from Download directory.</string>
     <string name="aec">Acoustic Echo Cancellation</string>
     <string name="aec_help">If checked, echo cancellation is attempted on call audio.</string>
+    <string name="failed_to_load_aec_module">Failed to load Acoustic Echo Cancellation module.</string>
     <string name="opus_bit_rate">Opus Bit Rate</string>
     <string name="opus_bit_rate_help">Average maximum bit rate used by Opus audio stream.
         Valid values are 6000-510000. Factory default is 28000.</string>
@@ -183,6 +187,8 @@ Check Apps → baresip → Permissions → Storage and that file \'accounts.bs\'
         Valid values are 0-100. Factory default is 0, which disables Opus Forward Error
         Correction (FEC).</string>
     <string name="_0" translatable="false">0</string>
+    <string name="invalid_opus_bitrate">Invalid Opus bitrate</string>
+    <string name="invalid_opus_packet_loss">Invalid Opus Packet Loss Percentage</string>
     <string name="ice_lite_mode">ICE Lite Mode</string>
     <string name="ice_lite_mode_help">If checked, ICE Lite Mode is used.</string>
     <string name="default_call_volume">Default Call Volume</string>