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Skype Hybrid Setup

Retired product. Microsoft retired Skype for Business Online on July 31, 2021, and support for Skype for Business Server 2015 and 2019 ended on October 14, 2025. Microsoft Teams replaces them. This article is kept for reference. Skype for Business Online retirement
Written July 2020. Microsoft changes these admin screens often, so the screenshots below may not match what you see today. The sequence of steps is usually still correct — if something looks wrong, tell us and we'll update it.

1.       Connect to SfB Online via PowerShell.

2.       Run this command to check the Tenant configuration

Get-CsTenantFederationConfiguration

3.       Run this command to enable Hybrid configuration on your Tenant 

Set-CsTenantFederationConfiguration -SharedSipAddressSpace $True

4.       Run this command on your On-Prem Front-End to check EDGE configuration, important settings are yellowed.

Get-CsAccessEdgeConfiguration
Identity                               : Global
AllowAnonymousUsers                    : True
AllowFederatedUsers                    : True
AllowOutsideUsers                      : True
BeClearingHouse                        : False
EnablePartnerDiscovery                 : True
DiscoveredPartnerVerificationLevel     : UseSourceVerification
EnableArchivingDisclaimer              : True
EnableUserReplicator                   : False
KeepCrlsUpToDateForPeers               : True
MarkSourceVerifiableOnOutgoingMessages : True
OutgoingTlsCountForFederatedPartners   : 4
DnsSrvCacheRecordCount                 : 131072
DiscoveredPartnerStandardRate          : 20
EnableDiscoveredPartnerContactsLimit   : True
MaxContactsPerDiscoveredPartner        : 1000
DiscoveredPartnerReportPeriodMinutes   : 60
MaxAcceptedCertificatesStored          : 1000
MaxRejectedCertificatesStored          : 500
CertificatesDeletedPercentage          : 20
SkypeSearchUrl                         : https://skypegraph.skype.com/search/v1.0
RoutingMethod                          : UseDnsSrvRouting

If settings are not as above, run this command to set it correctly

Set-CSAccessEdgeConfiguration -AllowOutsideUsers $true -AllowFederatedUsers $true -UseDnsSrvRouting -EnablePartnerDiscovery $true

5.       Run this command on your On-Prem Front-End to check existing Hosting Providers, 

Get-CsHostingProvider

find the one with ProxyFqdn = sipfed.online.lync.com

Identity : Skype for Business Online
Name : Skype for Business Online
ProxyFqdn : sipfed.online.lync.com
VerificationLevel : UseSourceVerification
Enabled : True
EnabledSharedAddressSpace : True
HostsOCSUsers : True
IsLocal : False
AutodiscoverUrl : https://webdir.online.lync.com/Autodiscover/AutodiscoverService.svc/root

6.       If some settings are different from above, remove the existing Hosting Provider and run this command to create the correct one 

New-CSHostingProvider -Identity "Skype for Business Online" -ProxyFqdn "sipfed.online.lync.com" -Enabled $true -EnabledSharedAddressSpace $true -HostsOCSUsers $true -VerificationLevel UseSourceVerification -IsLocal $false -AutodiscoverUrl https://webdir.online.lync.com/Autodiscover/AutodiscoverService.svc/root

Now your hybrid configuration should work

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