Voice over Internet Protocol, or what is simply known by many in the world already as VoIP technology, has finally been brought to the IT mainstream.
This is primarily due to the expanding adoption of digital telephony, as well as teleconferencing in business in the world of it all, today.
Adding voice surely, and maybe even fax, are two possibilities when one is considering moving over to VoIP. Even adding voice mail and video traffic to one's network would certainly harbor a much more busy network, inclusive of applications and data.
Link: White Paper: E-Book: 10 Key Things Your VoIP Firewall S