You can Schedule Lync Meetings when you are not connected to the Internet. While this will not work in all situations it depends on the configuration of your Lync deployment.
First off all the following settings must be configured Get-CsMeetingConfiguration:
AssignedConferenceTypeByDefault | True | Determines whether new meetings will be configured, by default, as public meetings. Set this value to True to use public meetings by default; set this value to False to use private meetings by default. The default value is True. |
EnableAssignedConferenceType | True | Indicates whether users are allowed to schedule public meetings. With a public meeting, the conference ID and the meeting link remain consistent each time the meeting is held. With a private meeting, the conference ID and meeting link change from meeting to meeting. |
This means that you will schedule meetings that have the same meeting ID & URL all the time unless you change some of the meeting options. While this is not a good security practice it may give you more flexibility.
Secondly you need to use Outlook and You must have scheduled at least one Online Meeting. Then Outlook Online Meeting Add-In will cache the following information about all the settings required to schedule the Default meeting.
And voila you can now schedule Lync meetings when Offline
