How to accept and reject Incoming call using customized buttons in android 10?

I'm using ConnectionServices but am unable to get how to accept and reject buttons work. Here am trying ITelephony services but as it is deprecated in API level 29 it doesn't work. Suggest to me any good technique or example of call accept and reject function that works in android 10. Here is my customized activity code

class CallReceiver : AppCompatActivity()  {
    private lateinit var binding: CustomScreenBinding

    @SuppressLint("Recycle")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = CustomScreenBinding.inflate(layoutInflater)
        setContentView(binding.root)
        keyguardManager = getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager
        audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
        val telephony = getSystemService(TELEPHONY_SERVICE) as TelephonyManager
        val contactName = intent.getStringExtra("u_name")
        Log.i("name", "name" + contactName)
        binding.name.text = contactName
        val contactNumber = intent.getStringExtra("u_number")
        Log.i("number", "number" + contactNumber)
        binding.number.text = contactNumber

        val intent = intent
        val id = intent.getLongExtra("u_id", 0)
        Log.i("data", id.toString())

        val contactUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, id)
        val displayPhotoUri =
            Uri.withAppendedPath(contactUri, ContactsContract.Contacts.Photo.DISPLAY_PHOTO)
        try {
            val fd = contentResolver.openAssetFileDescriptor(displayPhotoUri, "r")
            val buf = fd?.createInputStream()
            val my_btmp = BitmapFactory.decodeStream(buf)
            binding.photo.setImageBitmap(my_btmp)
        } catch (e: IOException) {
        }


        val telephonyService: ITelephony
        val tm = getSystemService(TELEPHONY_SERVICE)

            val c = Class.forName(tm.javaClass.name)
            val m = c.getDeclaredMethod("getITelephony")
            m.isAccessible = true
            telephonyService = m.invoke(tm) as ITelephony
            val bundle = intent.extras
            val phoneNumber = bundle!!.getString("incoming_number")
            Log.d("INCOMING", phoneNumber!!)

        binding.buttonHangup.setOnClickListener {

                    telephonyService.endCall()
                    Log.d("HANG UP", phoneNumber)


        }
        binding.buttonAnswer.setOnClickListener {
            telephonyService.answerRingingCall()
        }
    }
}