Terence Luk: On-prem Skype for Business Server 2015 federation with Skype for Business Online logs the event: "Unable to resolve DNS SRV record ";domain="fabrikam.com";dns-srv-result="NegativeResult";dns -source="WireQuery";source="sip.contoso.com"
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Certificate and DNS examples for an on-premises integration with Skype for Business | Pexip Infinity Docs
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Microsoft 365 DNS records for Cloudflare docs - _sipfederationtls SRV record (Skype for Business) is wrong · Issue #9289 · MicrosoftDocs/microsoft-365-docs · GitHub
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Skype for Business, Lync and Exchange Web Services (EWS) and different DNS Domains- Exchange crawling e.g. for presence
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