# Product Settings

The system allows you to set your default margin which will be applied when configuring services.

{% hint style="info" %}
The default margin can be overridden when you configure or edit a service.
{% endhint %}

It is also used as the default value when you order a new product for an existing configured service. This allows the product to be automatically added to Rebilling System without you needing to reconfigure the service and ensures you have a minimum margin added.

![](/files/-MhS3ZgabWkYyXRVssL8)

{% hint style="info" %}
The Default Margin mentioned here does not apply to Call Usage Charges. All Call usage costs are managed externally through the VoIPNow platform via Charging Plans and are not managed via the Rebilling system at all. 
{% endhint %}


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