Updating SIP Addresses in Skype for Business
When you migrate to Office 365, the preferred configuration is to have user email addresses and UPNs the same. Having a single identity makes it easier for users to understand. If you are implementing Skype for Business in Office 365, it will take the UPN of the user as the Skype address. Again, keeping a single identity is good. However, if you have an on-premises implementation of Skype for Business, then the Skype identity is configured in the attribute msRTCSIP-PrimaryUserAddress . This attribute contains a SIP (session initiation protocol) address that looks like an email address but with “sip:” at the start. For example: “sip: user @contoso.com”. The SIP addresses defined in your on-premises Skype for Business may or may not match the email addresses of the users. You need to verify whether the addresses match. If the SIP address does not match the email address, it is easy to change. On the Skype Server run the following PowerShell command: Set-CsUser -Identity userUPN -Si...