Which of the follow is not a standard method in the US for connecting telephone calls?
- Analog/POTS
- SIP/VOIP
- E1/BRI
- T1/PRI
EXPLANATION
Analog or Plain Old Telephone Service (POTS) are your standard (essentially) one line in per call telephone lines. These were fairly inefficient for larger organizations due to the sheer volume of calls needed and the number of physical lines that would be needed to accomplish many concurrent calls, for example a call center needing the ability to work with 45 concurrent calls would need essentially 45 Analog lines (although, later uses of the lines could incorporate some usage of more than one call per physical line), which is both costly and takes up a large volume of real-estate (space).In order to make multiple concurrent calls across one physical medium, the US telecommunications industry began to use T1 or PRI lines - which could support up to 23 concurrent calls over one "line" (or circuit). So, for that same business to make approximately 45 concurrent calls, only *2* circuits would be required.
As demands increased yet again and higher-speed backbone connections became available, VoIP (Voice over Internet Protocol) or SIP trunks have become the de-facto standard for high-usage / high-volume (and even low-volume) environments. The concurrent call limit per SIP or VoIP trunk is essentially limitless, bound *in-theory* only by the amount of bandwidth available to the destination/origin.
BRI circuits are essentially the same (or extremely similar) to the North American/US T1/PRI circuits, however, they are only found overseas/in European countries and NOT in the US.
*This question and the answers, including this explanation, are a simplification of many PSTN and Telecommunications terms and technologies. Additional details and information can be found by searching Wikipedia, as well as other scholarly resources, for the aforementioned terms,
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