Hoot-n-holler

[1] Any user can speak at any time and be heard over the system immediately - there is no need to pick up a phone, press a button or perform any other separate activation function.

Among other uses, it is popular with stock brokerage and other financial trading operations, as well as warehouse intercom applications.

[2] Hoot-n-holler capability provides a tightly targeted method of communication that can support thousands of users worldwide and is a critical component of voice trading systems.

[citation needed] Using IP means old analog dedicated circuits can be removed, eliminating their associated cost.

[3] This system allowed the various exchanges to instantly communicate current prices and other critical information during steep market declines.