Difference between DISA and DID?

What is the difference between DID and DISA??

Why? This feels a bit like homework. They are not mutually exclusive.

What I will volunteer is that the VoIP community misuses the term DID.

Howdy,

From:
wiki.asterisk.org/wiki/display/ … ation_DISA

From:
en.wikipedia.org/wiki/Direct_inward_dial

Cheers

Thank you