diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index 4ad306e4..84de4bb9 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -44,7 +44,6 @@ class Account(val accp: Long, virtualAor: String? = null) {
     var customParams = ""
 
     init {
-
         if (accp != 0L) {
             if (authPass == "")
                 authPass = NO_AUTH_PASS
@@ -70,35 +69,40 @@ class Account(val accp: Long, virtualAor: String? = null) {
                     break
                 }
             }
-
-            val extra = Api.account_extra(accp)
-            if (Utils.paramExists(extra, "nickname"))
-                nickName = Utils.paramValue(extra, "nickname")
-            if (Utils.paramExists(extra, "regint"))
-                configuredRegInt = Utils.paramValue(extra, "regint").toInt()
-            callHistory = Utils.paramValue(extra, "call_history") == ""
-            blockUnknown = Utils.paramExists(extra, "block_unknown")
-            if (Utils.paramExists(extra, "country_code"))
-                countryCode = Utils.paramValue(extra, "country_code")
-            if (Utils.paramExists(extra, "tel_provider"))
-                telProvider = URLDecoder.decode(Utils.paramValue(extra, "tel_provider"), "UTF-8")
-            numericKeypad = Utils.paramExists(extra, "numeric_keypad")
-            customParams = extra.substringAfter("last=empty").substringAfter(";")
         }
+
+        val extra = Api.account_extra(accp)
+        if (Utils.paramExists(extra, "nickname"))
+            nickName = Utils.paramValue(extra, "nickname")
+        isMobile = Utils.paramExists(extra, "is_mobile")
+        if (Utils.paramExists(extra, "regint"))
+            configuredRegInt = Utils.paramValue(extra, "regint").toInt()
+        callHistory = Utils.paramValue(extra, "call_history") == ""
+        blockUnknown = Utils.paramExists(extra, "block_unknown")
+        if (Utils.paramExists(extra, "country_code"))
+            countryCode = Utils.paramValue(extra, "country_code")
+        if (Utils.paramExists(extra, "tel_provider"))
+            telProvider = URLDecoder.decode(Utils.paramValue(extra, "tel_provider"), "UTF-8")
+        numericKeypad = Utils.paramExists(extra, "numeric_keypad")
+        customParams = extra.substringAfter("last=empty").substringAfter(";")
     }
 
     fun print() : String {
 
-        if (isMobile) return ""
+        var res = if (isMobile) {
+            "<${aor};transport=udp>"
+        } else {
+            if (displayName != "")
+                "\"${displayName}\" "
+            else
+                ""
+        }
 
-        var res = if (displayName != "")
-            "\"${displayName}\" "
-        else
-            ""
+        if (!isMobile) {
+            res = "$res<$luri>"
 
-        res = "$res<$luri>"
-
-        if (authUser != "") res += ";auth_user=\"${authUser}\""
+            if (authUser != "") res += ";auth_user=\"${authUser}\""
+        }
 
         if ((authPass != "") && !BaresipService.aorPasswords.containsKey(aor))
             res += ";auth_pass=\"${authPass}\""
@@ -160,13 +164,19 @@ class Account(val accp: Long, virtualAor: String? = null) {
         if (autoRedirect)
             res += ";sip_autoredirect=yes"
 
-        res += ";ptime=20;regint=${regint};regq=0.5;pubint=0;inreq_allowed=yes;call_transfer=yes"
+        res += ";ptime=20;regint=${regint};regq=0.5;pubint=0;inreq_allowed=yes"
+
+        if (isMobile)
+            res += ";call_transfer=no"
 
         var extra = ""
 
         if (nickName != "")
             extra += ";nickname=${nickName}"
 
+        if (isMobile)
+            extra += ";is_mobile=yes"
+
         if (!callHistory)
             extra += ";call_history=no"
 
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountScreen.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountScreen.kt
index cf3971fe..86ad2a97 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountScreen.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountScreen.kt
@@ -233,7 +233,7 @@ private fun AccountContent(
             horizontalArrangement = Arrangement.Start
         ) {
             val aorText = if (ua.account.isMobile) {
-                if (ua.account.aor == "tel:mobile")
+                if (ua.account.aor == "sip:mobile@pstn")
                     stringResource(R.string.not_available)
                 else
                     ua.account.aor
@@ -1258,37 +1258,44 @@ private fun AccountContent(
     ) {
         AoR()
         Nickname()
-        DisplayName()
-        AuthUser()
-        AuthPass()
-        if (showPasswordDialog.value)
-            AskPassword(ctx, navController, ua)
-        Outbound()
-        Register()
-        if (viewModel.register.collectAsState().value) {
-            RegInt()
-            CheckOrigin()
+        if (!ua.account.isMobile) {
+            DisplayName()
+            AuthUser()
+            AuthPass()
+            if (showPasswordDialog.value)
+                AskPassword(ctx, navController, ua)
+            Outbound()
+            Register()
+            if (viewModel.register.collectAsState().value) {
+                RegInt()
+                CheckOrigin()
+            }
         }
         BlockUnknown()
-        AudioCodecs(navController, aor)
-        MediaEnc()
-        MediaNat()
-        if (showStun) {
-            StunServer()
-            StunUser()
-            StunPass()
+        if (!ua.account.isMobile) {
+            AudioCodecs(navController, aor)
+            MediaEnc()
+            MediaNat()
+            if (showStun) {
+                StunServer()
+                StunUser()
+                StunPass()
+            }
+            RtcpMux()
+            Rel100()
+            Dtmf()
+            Redirect()
         }
-        RtcpMux()
-        Rel100()
-        Dtmf()
         Answer()
-        Redirect()
         Voicemail()
-        CountryCode()
-        TelProvider()
+        if (!ua.account.isMobile) {
+            CountryCode()
+            TelProvider()
+        }
         NumericKeypad()
         DefaultAccount()
-        CustomParams()
+        if (!ua.account.isMobile)
+            CustomParams()
     }
 }
 
diff --git a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
index cab10f92..299efba1 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
@@ -491,10 +491,9 @@ class BaresipService: Service() {
                 activeNetwork = cm.activeNetwork
                 Log.i(TAG, "Active network: $activeNetwork")
 
-                if (telecom) {
+                if (telecom)
                     registerPhoneAccount()
-                    addMobileUserAgent()
-                } else
+                else
                     if (btAdapter != null) {
                         Log.i(TAG, "Registering bluetooth receiver")
                         val filter = IntentFilter()
@@ -726,7 +725,9 @@ class BaresipService: Service() {
         if (ev[0] == "create") {
 
             val ua = UserAgent(uap)
-            ua.status = if (ua.account.regint == 0)
+            ua.status = if (ua.account.isMobile)
+                R.drawable.circle_green
+            else if (ua.account.regint == 0)
                 R.drawable.circle_white
             else
                 circleYellow.getValue(colorblind)
@@ -1850,28 +1851,34 @@ class BaresipService: Service() {
 
     private fun addMobileUserAgent() {
         if (!telecom || Utils.pstnAccountHandle(this) == null) return
-        val mobileAor = Utils.getLine1Number(this)?.let { "tel:$it" } ?: "tel:mobile"
+
+        val userPart = Utils.getLine1Number(this) ?: "mobile"
+        val mobileAor = "sip:$userPart@pstn"
+
         val existingMobileUa = uas.value.find { it.account.isMobile }
         if (existingMobileUa != null) {
-            // Replace previous tel:mobile with real number
-            if (existingMobileUa.account.aor == "tel:mobile" && mobileAor != "tel:mobile") {
+            // Replace previous sip:mobile@pstn with real number if available
+            if (existingMobileUa.account.aor == "sip:mobile@pstn" && mobileAor != "sip:mobile@pstn") {
                 val updatedUas = uas.value.toMutableList()
                 updatedUas.remove(existingMobileUa)
                 uas.value = updatedUas.toList()
-            } else {
+            } else
                 return
-            }
         }
 
         val account = Account(0L, mobileAor)
         account.isMobile = true
         account.nickName = "Mobile"
+        account.regint = 0
+        account.telProvider = ""
         val mobileUa = UserAgent(0L, account)
 
         val updatedUas = uas.value.toMutableList()
         updatedUas.add(mobileUa)
         uas.value = updatedUas.toList()
         uasStatus.value = UserAgent.statusMap()
+
+        Account.saveAccounts()
     }
 
     private fun toast(message: String, length: Int = Toast.LENGTH_SHORT) {