How can i add SRV-record for LYNC in Office 365?

Login to your DNS settings for your domain name on DirectAdmin

first one:

Code:

left: _sip._tls
right: 100 1 443 sipdir.online.lync.com.

second one:

Code:

left: _sipfederationtls._tcp
right: 100 1 5061 sipdir.online.lync.com.

You do not put the TTL because that value defaults to whatever directadmin is using as the default TTL.

Make sure you put the trailing period after lync.com because it is important.

This is how it will output into your dns zone:

Code:

_sip._tls       14400   IN      SRV     100 1 443 sipdir.online.lync.com.
_sipfederationtls._tcp  14400   IN      SRV     100 1 5061 sipdir.online.lync.com.