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SKype4B can login from home but not from work

The DNS records required to direct to the correct Skype4b server need to be added to internal Servers for proper routing.

If you use split-brain DNS (where your domain name resolves to a different set of DNS servers outside your network than inside), you will have to add these DNS records in both places. In general, the records must be present anywhere a user resolves your DNS domain name.

The four DNS records you must create are as follows:

CNAME Records

Alias Name Target Host

SRV (Service) Records

Service Protocol Priority Weight Port Target
_sipfederationtls _tcp 0 0 5061

sip.Company Domain


_sip _tls 0 0 443

sip.Company Domain



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