For the Univonix Migration Tools to work correctly you will need to have the Skype for Business Server DNS records in place: You will need to have one of the following records in place that resolves to your FE pool/server.

  • SRV    _sipinternaltls._tcp.{yourdomain.com}
  • SRV    _sip._tls.{yourdomain.com}
  • A         sip.{yourdomain.com}

Verify DNS records

  1. Log on to a trusted application server.
  2. Click Start, and then type cmd, and press Enter.
  3. To verify A records type nslookup sip.contoso.com (replace contoso.com with your domain), and press Enter.
  4. To verify SRV recoreds type nslookup
    1.  Type _sipinternaltls._tcp. domain or _sip._tls.domain (for example, _sipinternaltls._tcp.contoso.com), and then press Enter.