Hello! I understand that when you try to make calls through the Alaap app, the numbers appear active, but the call doesn't go through, and later it shows "closed/off" or "পরবর্তী বন্ধ আছে" message. Let's see how I can help you get this sorted out.

To clarify first:
- Are you trying to call regular phone numbers or other Alaap app users?
- Is this happening with all calls or only specific numbers?
- Have you checked if your internet connection is stable? Alaap calls often need good internet connectivity.
- Are you using any call-blocker or security apps on your Android 10 WebKit device?

Meanwhile, here are some initial steps to try:

1. Check Internet Connection: Make sure your phone has a stable internet connection (Wi-Fi or mobile data). Alaap uses VoIP for calls, so internet quality is key.

2. Update Alaap App: Go to the Google Play Store and ensure your Alaap app is updated to the latest version.

3. Restart Your Device: Sometimes a simple reboot helps clear any temporary glitches.

4. Check App Permissions: On your Android 10 device, go to Settings > Apps > Alaap > Permissions, and make sure the app has permission to access the microphone and phone features.

5. Clear Cache of Alaap App: Go to Settings > Apps > Alaap > Storage > Clear Cache. This can resolve minor app errors.

6. Check Alaap Account Status: Sometimes calling issues are related to account or balance problems. If Alaap uses any calling credits or subscription, verify if your status and balance are fine.

7. Try Calling Another Number: To isolate whether it's a general problem or specific numbers.

If after these steps calls still don't go through and you continue seeing "closed/off" messages despite the numbers showing active, it may be related to network or server-side issues Alaap is facing.

Based on some reports, this kind of issue may happen if:
- The called party’s phone is unreachable or offline at the moment.
- Network restrictions or firewall at either end blocking VoIP traffic.
- Temporary app or server glitches.

If you can provide a bit more detail on your experience (e.g., app version, specific error messages, whether the call rings at the other side or not), I can guide you further or escalate the matter to Alaap support if needed.

Are you able to try these steps and let me know how it goes?