Telephony is used describe the science of transmitting voice over a telecommunications network. Voice over Internet Protocol, is another way of saying IP Telephony. It involves the transmission of telephone calls over a data network like the Internet. In other words, VoIP can send voice, fax and other information over the Internet, rather than through the (PSTN) or regular telephone network.
Multi-QoS captures and decodes the complete H.323 and related protocol suite including Cisco's SSP, SIP, ASN.1, SGCP, and MGCP;measures and meters multimedia (voice, video data) streams on 10/100 and Gigabit Ethernet networks.