[Asterisk-Users] Sending broadcasts to all phones?

[Stan Brinkerhoff]

A friend of mine has a real panasonic PBX setup at his house, and is 
able to pick up the phone, dial an extension, and it broadcasts what he 
says over every phone in his house without the phones having to be 
picked up. 

What is this feature called?

Would it be possible to set this up with Asterisk given the appropriate 
phones? (Cisco?)

Thanks,
Stan