Zentrunk Geo Permissions


    Wholesale SIP trunking fraud is becoming more common. This type of fraud is often difficult to detect since the call patterns look similar to normal usage. Therefore, it is crucial to take proactive measures to avoid scenarios such as:

    1. Calls placed to high-risk premium destinations
    2. Overnight loss of credits
    3. Calls placed from your account to unknown numbers, leading to unintended consequences

    Zentrunk Geo Permissions empowers Plivo SIP trunk users to selectively enable or disable outbound calling to international destinations. This feature will help you avoid calls to high-cost routes, as well as prevent other fraudulent activities.

    Outbound SIP Trunk Geo-Preferences

    Zentrunk users can now restrict the number of countries to which you can place calls globally. You can navigate to the Geo Permissions settings in your Console and select the countries you want to enable outbound calling towards.

    Placing a country-level block: You can now enable calling to selected destinations by choosing the specific countries to which calls can be made for each outbound trunk in your Plivo account. Zentrunk will not allow calls to countries that are deselected.


    In the example pictured above, calls to Spain, Sweden, and Switzerland are allowed. Calling to other countries on this list will be barred.

    Once the Geo Permissions countries are updated, save your changes. The country restrictions will be in effect immediately. There will not be any other impact on the ongoing calls on the platform.

    Placing a High-Risk Voice Network Group Block: Plivo analyzes call trends and rates of premium voice network groups (VNGs) for each country under worldwide coverage periodically.

    By observing such patterns, we maintain a list of high-risk VNGs. By enabling this, outbound calls to such pre identified risky prefix clusters will be blocked. Plivo will periodically update this list.

    High risk permissions

    If a call is placed to a destination number that belongs to a country that has not been selected in Geo-Permissions, the following response codes will show in your call detail report:

    SIP Response Code: 403 - Barred Country; Zentrunk Hangup Code: 4650

    Description: The number has been blocked in geo permissions settings. Any calls made to this number belong to a specific country or number group and will not go through since it has been barred.