Should notice of the meeting be given to directors who's outside India currently?

As per Section 101(3) of companies act, 2013, notice of the meeting should be served to -
1) Members
2) Director
3) Auditor
4) Legal representative of deceased member
5) Assignee of insolvent member.

So, the notice of the meeting has to be sent to the director irrespective of his place of stay. In this case, the notice can be sent through electronic mode, that is, e-mail.

Yes. Notice must be given to each and every director. If director is outside the country, then notice can be sent through an email.