Be aware that the _sipfederationstls._ DNS SRV record must be added, even if you do not federate with any other domains. The following is an example screenshot of the results of the test:įor calls to be transferred to voice mail, all DNS records must be configured correctly. Review the results, and make sure that the _sipfederationtls._tcp.com DNS SRV record resolves successfully and is configured correctly. Type the sign-in address that you use for Skype for Business Online, type the CAPTCHA text, click to select the check box to agree to the terms, and then click Perform Test. Select Office365 Vanity/Custom Domain Name Settings Test for Lync. In a web browser, go to Lync Remote Connectivity Analyzer. To resolve this issue, use the Lync Remote Connectivity Analyzer to make sure that the DNS records for your domain are set up correctly. The call never is transferred to voice mail. Instead, the person who is calling you hears a fast busy tone.

In this scenario, if an incoming call isn't answered, the call isn't transferred to Exchange Online Unified Messaging voice mail as expected. You can answer calls that are made to the Lync To Phone number, and you can make calls to other numbers. Lync To Phone and Exchange Online voice mail are set up according to the documentation. You are set up for Microsoft 365, and you have valid Skype for Business Online (formerly Lync Online) and Exchange Online licenses.

Microsoft lync phone system