From an external workstation located outside the internal network use these nslookup commands to search for any Service, Host, or Alias records specifically pointing to an external registrar (e.g.PS C:\> nslookup -q=srv _sipinternaltls._
From a internal workstation located inside the corporate network use the Command Prompt or PowerShell to enter the following nslookup commands to search for any Service, Host, or Alias records specifically pointing to an internal registrar (e.g.
The following steps can be used to validate if the appropriate DNS records exists for the SIP domain to support legacy discovery processes. The Lync/SfB registrar pool FQDN will be needed for the desired user account. Either way there are multiple potential registrars that client would be directed to connect to depending on the client’s network location at the time, as well as VPN connectivity is applicable. Some of these environments may also be configured in the Hybrid model with a split-domain configuration connected to an Office 365 tenant. This section focuses on Lync Server and Skype for Business Server deployments where on-premises Front End pools and Edge Server pools are deployed. The configuration that supports these is still used by most clients but was the only available method supported in legacy clients like Lync 2010 and devices like Lync Phone Edition. Not all of the natively interoperable voice and video solutions supported with Lync and Skype for Business today leverage the newer Lyncdiscover web service model and may still need to automatically discover the SIP registrar directly. To do this one must know the proper FQDN of the desired Microsoft SIP registrar.
This can be used as a reference for other articles on this site as a common step performed when troubleshooting device registrations to Skype for Business is to manually configure the endpoint. (This content was originally to be part of another article but was split into a separate post for easier reference.) This brief article walks through some common steps which can be used to locate the Fully Qualified Domain Name (FQDN) of a Lync or Skype for Business registrar from either on-premises or online environments.
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