---
title: "MS O365 Admin - Voicemail IPs To Whitelist"
slug: "ms-o365-admin-voicemail-ips-to-whitelist"
tags: ["calltower", "public"]
updated: 2026-09-18T15:42:04Z
published: 2026-09-18T15:42:04Z
canonical: "learn.calltower.com/ms-o365-admin-voicemail-ips-to-whitelist"
---

> ## 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 - Voicemail IPs To Whitelist

## Goal

This article addresses the fraudulent email error received from voicemail or email notifications when using CallTower Hosted Skype for Business Voicemail

## Adding IP addresses to Office 365

1. Log into Office 365 [https://security.microsoft.com/antispam](https://security.microsoft.com/antispam) using Global Admin Credentials
2. Click on Connection filter policy (Default).

![clipboard_e6b8ae7a66e2b27b43ad55fc2316f12b7.png](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/clipboard_e6b8ae7a66e2b27b43ad55fc2316f12b7.png?sv=2026-02-06&spr=https&st=2026-11-04T22%3A54%3A27Z&se=2026-11-04T23%3A54%3A27Z&sr=c&sp=r&sig=xRvm3wgZsbjMXR0ZBmbP%2BWM6Ba59TKGL%2F62hweAm1RU%3D)
3. Click Edit connection filter policy.

![clipboard_ee3392432e39dccaab9d2aab0dfface99.png](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/clipboard_ee3392432e39dccaab9d2aab0dfface99.png?sv=2026-02-06&spr=https&st=2026-11-04T22%3A54%3A27Z&se=2026-11-04T23%3A54%3A27Z&sr=c&sp=r&sig=xRvm3wgZsbjMXR0ZBmbP%2BWM6Ba59TKGL%2F62hweAm1RU%3D)
4. Enter the two IP Addresses 205.196.174.41 and 205.196.172.135 as shown below. Check Turn on safe list and click Save at the bottom.

![clipboard_e2591b623864a01d60f2fc53a88ab65e6.png](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/clipboard_e2591b623864a01d60f2fc53a88ab65e6.png?sv=2026-02-06&spr=https&st=2026-11-04T22%3A54%3A27Z&se=2026-11-04T23%3A54%3A27Z&sr=c&sp=r&sig=xRvm3wgZsbjMXR0ZBmbP%2BWM6Ba59TKGL%2F62hweAm1RU%3D)