---
title: "MS O365 Admin - Migrating From Basic to Modern Authentication for Cisco Voicemail"
slug: "ms-o365-admin-migrating-from-basic-to-modern-authentication-for-cisco-voicemail"
tags: ["calltower", "public"]
updated: 2026-09-18T13:21:36Z
published: 2026-09-18T13:21:36Z
canonical: "learn.calltower.com/ms-o365-admin-migrating-from-basic-to-modern-authentication-for-cisco-voicemail"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://learn.calltower.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MS O365 Admin - Migrating From Basic to Modern Authentication for Cisco Voicemail

## Why do I have to make this change?

Microsoft is retiring Basic Authentication for Exchange Online October 1, 2022. (article = [https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online](https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online)) In order to retrieve your voicemails via your phone this will need to be completed.

**If you do not complete this task the following features will no longer function:**

- MWI light on the phone indicating new voicemail
- Ability to check Voicemail from your phone or calling a pilot number.
- Remote Notification for new voicemails

**You will still get your voicemails sent to your email address.**

## Register your application

To use OAuth, an application must have an application ID issued by Azure Active Directory. In this tutorial, it is assumed that the application is a console application, so you need to register your application as a public client with Azure Active Directory. You can register an application in the Azure Active Directory admin center or by using Microsoft Graph.

1. Open a browser and navigate to the [Azure Active Directory admin center](https://aad.portal.azure.com/) and login using a **personal account** (aka: Microsoft Account) or **Work or School Account**.
2. Select **Azure Active Directory** in the left-hand navigation, then select **App registrations** under **Manage**.
3. Select **New registration**. On the **Register an application** page, set the values as follows.
  - Set **Name** to a friendly name for your app.
  - Set **Supported account types** to the choice that makes sense for your scenario.
  - For **Redirect URI**, change the dropdown to **Public client (mobile & desktop)** and set the value to `https://login.microsoftonline.com/common/oauth2/nativeclient`.
4. Choose **Register**. On the next page, copy the values of the **Application (client) ID** and **Directory (tenant) ID** and save them, you will need them later.

### Configure for app-only authentication

To use application permissions, follow these additional steps.

1. Select **Manifest** in the left-hand navigation under **Manage**.
2. Locate the `requiredResourceAccess` property in the manifest, and add the following inside the square brackets (`[]`):

JSON

```plaintext
{
    "resourceAppId": "00000002-0000-0ff1-ce00-000000000000",
    "resourceAccess": [
        {
            "id": "dc890d15-9560-4a4c-9b7f-a736ec74ec40",
            "type": "Role"
        }
    ]
}
```
3. Select **Save**.
4. Select **API permissions** under **Manage**. Confirm that the **full_access_as_app** permission is listed.
5. Select **Grant admin consent for org** and accept the consent dialog.
6. Select **Certificates & Secrets** in the left-hand navigation under **Manage**.
7. Select **New client secret**, enter a short description and select **Add**.
8. Copy the **Value** of the newly added client secret and save it, you will need it later.

### The 3 items Calltower needs

- appId
- Client Secret Value
- tenantId

JavaScript Object Notation, is a simple, organized format that computers use to store and exchange information in a way that's easy for both people and applications to read.

Application Programming Interface, a set of protocols and tools that allows different software applications to communicate with each other.