Clarity For: External DNS records required for Skype for Business Online

[BrianMcNeese]

trafficstars

Can we verify what DNS records are actually needed for Microsoft Teams (and why)? There's also a note in there that says the records are needed especially in hybrid scenario...I think this is false because in hybrid we typically leave DNS pointed to the on-prem SfB deployment until all users have been migrated.

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Document Details

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• ID: dce215c7-f61f-44c5-43c1-2fa1f2a39220
• Version Independent ID: d65a9513-432a-d0fe-1431-da5ad2e631eb
• Content: External Domain Name System records for Office 365 - Microsoft 365 Enterprise
• Content Source: microsoft-365/enterprise/external-domain-name-system-records.md
• Service: o365-administration
• GitHub Login: @kelleyvice-msft
• Microsoft Alias: kvice

[yogkumgit]

@kelleyvice-msft Please add your comment and help us in resolving this issue. Thanks.

[rpodric]

I'm not sure what the activity in this thread since Feb 24 means, but it looks like there hasn't been any progress.

The OP's point stands to this day. The doc saying this...

"These DNS records also apply to Teams, especially in a hybrid Teams and Skype for Business scenario, where certain federation issues could arise."

...is misleading and vague. The 4 specific ones in that section of the doc should be explicitly defined in relation to:

• Teams (only): I think 0 of 4 are needed. This is the most common mode, so it should be crystal clear.
• Teams (hybrid): Unclear which of the 4, if any (probably: none)
• Teams (federation with SfB): Unclear which of the 4, if any
• Teams (federation with Skype consumer): sipfederationtls

Further clarity: _sip._tls SRV record handles sign in for the SfB client _sipfederationtls handles federation in Microsoft Teams CNAME lyncdiscover.contoso.com handles sign for the SfB client and specifically the SfB mobile client CNAME sip.contoso.com handles sign in for the SfB client

[kelleyvice-msft]

Back from leave of absence. I'll look into this with the PG.

[kelleyvice-msft]

Searching for SME to provide answers for this.

[kelleyvice-msft]

I've identified contacts and requested support to resolve these questions. I'll update the issue as soon as I have any new information.

[kelleyvice-msft]

I have received some new guidance from the engineering team and am revising the article. I'll update and close this issue once the revision is published. -Kelley

[yogkumgit]

@kelleyvice-msft please update. Thanks

[kelleyvice-msft]

Revisions complete, merging PR today.