IRSF
International Revenue Share Fraud is a fraud scenario in which the fraudulent user earns money by directing lots of traffic to his or her own revenue share numbers.
Probe
A machine which filters and processes network traffic. It doesn't calculate the statistics.
PBX
Private Branch Exchange is a telephone exchange (often SIP based) that connects a business to a VoIP carrier (Communication Service Provider).
RTP
The voice part of the network traffic, as opposed to the signaling (meta) part.
VLAN
Virtual Local Area Network is a technique to separate a network into distinct, isolated broadcast domains.
See https://en.wikipedia.org/wiki/Virtual_LAN
