Improved USSD and MMI code handling

app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt

@@ -1697,9 +1697,24 @@ class BaresipService: Service() {
     fun runCall(uap: Long, uri: String, conferenceCall: Boolean, onHoldCallp: Long) {
 
         val ua = UserAgent.ofUap(uap)
-        if (ua != null && ua.account.isMobile && Utils.isUssd(uri)) {
-            sendUssd(Utils.uriUserPart(uri))
-            return
+        if (ua != null && ua.account.isMobile) {
+            val user = Utils.uriUserPart(uri)
+            if (user.startsWith("*#*#") && user.endsWith("#*#*")) {
+                val code = user.substring(4, user.length - 4)
+                val intent = Intent("android.provider.Telephony.SECRET_CODE", "android_secret_code://$code".toUri())
+                sendBroadcast(intent)
+                postServiceEvent(ServiceEvent("ussd response", arrayListOf(uap, user, ""), System.nanoTime()))
+                return
+            }
+            if (user == "*#06#") {
+                val imei = getDeviceId(this)
+                postServiceEvent(ServiceEvent("imei", arrayListOf(uap, user, imei), System.nanoTime()))
+                return
+            }
+            if (Utils.isUssd(uri)) {
+                sendUssd(user)
+                return
+            }
         }
 
         val executeCall = {
@@ -2338,6 +2353,16 @@ class BaresipService: Service() {
         }
     }
 
+    @SuppressLint("HardwareIds", "MissingPermission")
+    private fun getDeviceId(context: Context): String {
+        val tm = context.getSystemService(TELEPHONY_SERVICE) as TelephonyManager
+        return try {
+            tm.imei ?: tm.meid ?: "N/A"
+        } catch (_: SecurityException) {
+            "N/A"
+        }
+    }
+
     private fun toast(message: String, length: Int = Toast.LENGTH_SHORT) {
         Handler(Looper.getMainLooper()).post {
             Toast.makeText(this, message, length).show()

app/src/main/kotlin/com/tutpro/baresip/MainScreen.kt

@@ -2339,6 +2339,15 @@ fun handleServiceEvent(ctx: Context, viewModel: ViewModel, event: String, params
     val aor = ua.account.aor
 
     when (ev[0]) {
+        "imei" -> {
+            if (aor == viewModel.selectedAor.value) {
+                viewModel.dialerState.callButtonsEnabled.value = true
+                viewModel.dialerState.callUri.value = ""
+            }
+            handleDialog(ctx, ctx.getString(R.string.info), "IMEI: " + (params[2] as String))
+            handleNextEvent()
+            return
+        }
         "ussd response" -> {
             if (aor == viewModel.selectedAor.value) {
                 viewModel.dialerState.callButtonsEnabled.value = true

app/src/main/kotlin/com/tutpro/baresip/Utils.kt

@@ -378,8 +378,9 @@ object Utils {
     }
 
     fun isUssd(uri: String): Boolean {
-        val user = uriUserPart(uri)
-        return user.startsWith("*") && user.endsWith("#")
+        val u = uriUserPart(uri)
+        // Must start with * or # and must end with #, but exclude "Secret Code" pattern (*#*#...#*#*)
+        return (u.startsWith("*") || u.startsWith("#")) && u.endsWith("#") && !u.startsWith("*#*#")
     }
 
     fun checkUri(uri: String): Boolean {