Come settare il reindirizzamento di chiamata via codici mmi?

[docRekd]

Sto cercando di redirigere le chiamate usando il codice mmi *21*telNum# programmaticamente nel codice

Ecco il mio ultimo tentativo

import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Bundle
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.net.toUri
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import org.linphone.LinphoneApplication.Companion.corePreferences
import org.linphone.R

class ConfirmRedirectionActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_confirm_redirection)
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
            insets
        }
        findViewById<android.widget.Button>(R.id.button).setOnClickListener { setupForwarding() }
    }

    fun setupForwarding() {
        if (ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.CALL_PHONE
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.CALL_PHONE),
                CALL_PHONE_PERMISSION_REQUEST_CODE
            )
            return
        }


        fun telCall(telNum: String) =
            startActivity(
                Intent(Intent.ACTION_CALL).apply {
                    flags = Intent.FLAG_ACTIVITY_NEW_TASK
                    data = Uri.fromParts("tel", telNum, null)
                    Log.i("About to call $data")
                }
            )
        telCall("##002#")
        Log.i("Cleared call forwarding")
        telCall("*21*${intent.getStringExtra("telIn") ?: ""}#")
        Log.i("Call forwarding enabled")

        corePreferences.firstStart = false
        startActivity(Intent(this, MainActivity::class.java)) // Go to dialer view
        finish()
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == CALL_PHONE_PERMISSION_REQUEST_CODE) {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                setupForwarding()
            } else {
                // TODO: Handle permission denied
            }
        }
    }

    companion object {
        private const val CALL_PHONE_PERMISSION_REQUEST_CODE = 100
    }
}

Questo codice reindirizza verso MainActivity (come me l'aspetto) ma quando provo a controllare con *#21# risulta il reindirizzamento non settato

Ho anche provato con TelecomService.placeCall (fa solo chiamate, non gestisce codici mmi) e TelecomService.handleMmi ( richiede di essere l'app dialer di sistema)