---
title: "MS Teams General Admin - DNS Settings"
slug: "ms-teams-general-admin-dns-settings"
tags: ["calltower", "public"]
updated: 2026-07-27T13:37:26Z
published: 2026-07-27T13:37:26Z
canonical: "learn.calltower.com/ms-teams-general-admin-dns-settings"
stale: true
---

> ## 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 Teams General Admin - DNS Settings

When a customer is moving their Office 365 tenant from Skype for Business to Microsoft Teams, or for Microsoft Teams use in general, DNS records on any domains in the O365 tenant should be verified to match the below. There are two CNAME records to verify and 2 SRV records. These records will be found with whatever company is the domain hoster for their domains, typical examples being companies such as GoDaddy, ClouDNS, Cloudflare, etc. Records should be verified for both internal and external DNS.

| Host name (CNAME record) | Points to address or value | TTL (time to live) |
| --- | --- | --- |
| SIP | sipdir.online.lync.com. | 3600 |
| lyncdiscover | webdir.online.lync.com. | 3600 |

| Service (SRV record) | Protocol | Port | Weight | Priority | TTL (time to live) | Name | Target |
| --- | --- | --- | --- | --- | --- | --- | --- |
| _sip | _tls | 443 | 1 | 100 | 3600 | @ | sipdir.online.lync.com. |
| _sipfederationtls | _tcp | 5061 | 1 | 100 | 3600 | @ | sipfed.online.lync.com. |

Further information can be found at this Microsoft site:

[https://docs.microsoft.com/en-us/mic...o365-worldwide](https://docs.microsoft.com/en-us/microsoft-365/enterprise/external-domain-name-system-records?view=o365-worldwide)

Session Initiation Protocol, is the technology that starts, manages, and ends internet-based phone calls and video meetings between people and devices.