Grandstream Networks Grandstream BudgeTone 200 - Manual (Page 51)

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There are two types of echo of relevance in telephony: acoustic echo and hybrid
echo. Speech compression techniques and digital processing delay often
contribute to echo generation in telephone networks.
H.323
A suite of standards for multimedia conferences on traditional packet-switched
networks.
HTTP
Hyper Text Transfer Protocol; the World Wide Web protocol that performs the
request and retrieve functions of a server
IP
Internet Protocol. A packet-based protocol for delivering data across networks.
IP-PBX
IP-based Private Branch Exchange
IP Telephony
(Internet Protocol telephony, also known as Voice over IP Telephony) A general
term for the technologies that use the Internet Protocol's packet-switched
connections to exchange voice, fax, and other forms of information that have
traditionally been carried over the dedicated circuit-switched connections of the
public switched telephone network (PSTN). The basic steps involved in
originating an IP Telephony call are conversion of the analog voice signal to
digital format and compression/translation of the signal into Internet protocol (IP)
packets for transmission over the Internet or other packet-switched networks; the
process is reversed at the receiving end. The terms IP Telephony and Internet
Telephony are often used to mean the same; however, they are not 100 per cent
interchangeable, since Internet is only a subcase of packet-switched networks. For
users who have free or fixed-price Internet access, IP Telephony software
essentially provides free telephone calls anywhere in the world. However, the
challenge of IP Telephony is maintaining the quality of service expected by
subscribers. Session border controllers resolve this issue by providing quality
assurance comparable to legacy telephone systems.
IVR
IVR is a software application that accepts a combination of voice telephone input
and touch-tone keypad selection and provides appropriate responses in the form
of voice, fax, callback, e-mail and perhaps other media.
MTU
A Maximum Transmission Unit (MTU) is the largest size packet or frame ,
specified in octet s (eight-bit bytes), that can be sent in a packet- or frame-based
network such as the Internet. The maximum for Ethernet is 1500 byte.