A Starter Kit on VoIP
Confused about whether Voice over IP is the way for your business to go? You're not the only one. The technology has been gaining steam in the tech press during the past year, while federal lawmakers and regulators wrangle over who will have the regulatory upper hand.
Enterprise VoIP Planet
The IT Manager's Guide to Voice over IP
RTCP Packet Format
This specification defines several RTCP packet types to carry a variety of control information.
RTCP Packet Format - Illustrated Header
RTCP is the Real-time Transport Control Protocol, which may be used as a lightweight companion to RTP to convey a number of statistics and other information about an RTP flow between recipients and senders.