Microsoft Graph API

To subscribe to change notifications for the /communications/callRecords endpoint in the Microsoft Graph API, you need to provide a valid URL in the notificationUrl parameter. This URL should be publicly accessible and capable of receiving HTTP POST requests from the Microsoft Graph service.

Here's an example of how you can set up the subscription using C#:

using Microsoft.Graph;
using System;

public async Task SubscribeToCallRecordsNotifications(string notificationUrl)
{
    var graphClient = new GraphServiceClient("yourAccessToken");

    var subscription = new Subscription
    {
        ChangeType = "created,updated",
        NotificationUrl = notificationUrl,
        Resource = "/communications/callRecords",
        ExpirationDateTime = DateTime.UtcNow.AddMinutes(30),
        ClientState = "yourClientState"
    };

    var newSubscription = await graphClient.Subscriptions
        .Request()
        .AddAsync(subscription);

    return newSubscription.Id;
}

In the above code, replace "yourAccessToken" with the access token for your application, and "yourClientState" with any string that you want to associate with the subscription.

Once you have set up the subscription, the Microsoft Graph service will send notifications to the provided notificationUrl whenever there are changes to the call records. You can handle the results by implementing an HTTP endpoint at the specified notificationUrl to receive and process the notifications.