Telephony (/təˈlɛfəni/ tə-LEF-ə-nee) is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone.

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~ (CCS) A unit used (in North America) to quantify the total traffic running in a network. 1 CCS is 100 call-seconds. That means 1 CCS could be 2 calls of 50 seconds duration or 20 calls of 5 seconds duration. ~ Also known the hundred call second ~ 1 CCS = 100sec call    = 100sec x 1 min / 60 sec x 1 hour / 60 min    = 1 / 36 Erlang
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DIFFERENCE BETWEEN ERLANG AND GRADE OF SERVICE Erlang Erlang is the unit of telephone call traffic. It is defined as average number of calls in progress at some time. Erlang equation is mentioned below. Erlang traffic measurements are carried out by wireless network designers to understand the voice traffic patterns in the network. This will help them derive how many lines will be needed between telephone system and PSTN central office(CO) or between the two cellular/wireless networks. Erlang A = C*h/T Where, C is average no. of call arrived during time interval T h is the average call holding time. In North America CCS(Call Seconds per hour) is used in place of Erlang. 1 Erlang = 36 CCS. Erlang Traffic models Following section mentions difference between Erlang B, Extended Erlang B and Erlang C. • Erlang B: It is used to derive number of lines needed when traffic in erlangs during busy hour is known. This traffic model is mostly used. It assumes that blocked calls are c...
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IP telephony [ edit ] Main article:  Voice over IP A commercial IP telephone, with keypad, control keys, and screen functions to perform configuration and user features. The field of technology available for telephony been broadened with the advent of new communication technologies. Telephony now included the technologies of Internet services and mobile communication, including video conferencing. The new technologies based on  Internet Protocol  (IP) concepts are often referred to separately as voice over IP (VoIP) telephony, also commonly referred to as IP telephony or Internet telephony. Unlike traditional phone service, IP telephony service is relatively unregulated by government. In the United States, the Federal Communications Commission (FCC) regulates phone-to-phone connections, but says they do not plan to regulate connections between a phone user and an IP telephony service provider. [ citation needed ] A specialization of digital telephony, Int...
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