Write the methods of internal communication?

Over the years there have evolved various ways of communicating internally. There are many method are used in internal communication like, 

1. One-on-one meetings 

2.Staff/team meetings 

3.Emails 

4.Voice mails 

5.Video broadcasts 

6.Intranets 

7.Audio files (usually downloadable audio, but increasingly sent out via rss technology 

8.Staff-to-staff newsletters 

9.Corporate newsletters 

10.Annual Reports 

11.Quarterly Reports 

12.Roadshows