What is the formal technology of communication between office and home?

Since most companies would like fill their employee with tons of works and let them work full hours per day, they tried every manner to hinder their employees to communicate with their family during working hours, such as blocking firewall ports, etc. In this way, the communication between staffs and their family during working hours is quite different from that between head and oversee office.

These technology includes traditional telephone/SMS, Emails, Web-based instant messaging softwares, such as web-based MSN, gmail chat, etc (Http port is normally free).

Simualtaneously, web 2.0 applications such as facebook, have already begun to show their influence on the communication manner between office and home, and therefore, in the near future, web 2.0 may influence this and P2P over IPv6 may also play its role in this big picture.