Learn tech-related stuff
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Inventing something new
August 1991, Tim Berners-Lee at CERN turned on the first website, prior to this the world wide web did not exist. Prior to this, one would hava to visit the library to find out information. This is research by inventing something new.
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SnipIT No 5: Find the version of Apache on a Linux machine
SnipIT is a series of short blogs containing useful information in an easily digestible format. httpd is the Apache HTTP server program which can be installed on a Linux server (sudo yum install httpd). To find out which version is running on your system, type http -v at a command prompt when connected to the server.…
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Finding out something
Tends to apply to physical sciences involving experimentation and observation. e.g. observing behaviour of a bird to establish how it finds it’s way half-way around the world during migration. Use new technology such as GPS and micro-transponders to tag a bird and map their route. New knowledge as routes were not previously known before the…
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What is Research?
Answering questions. Research starts with a question. Research is: proving a theory done by experts used to establish facts about something scientific objective a lot of hard work and not fun All of above can apply and equally none! Scientific research – find out something new and something, or invent something new. Keyword is “new”.
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Benefits of VoIP
Lower operational cost – single infrastructure, free additional features (caller ID & conference call). Flexibility – more than one call over single broadband connection. Security – encrypt/authenticate IP stream. Integration – video conversation, data file exchange & audio conference.
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Corporate Users
Many large companies have extensive data communications networks internally and across sites. No need to spend extra for voice services, use existing network for VoIP services. Advantages: Migrating from copper-wire to VoIP over data network Better use of bandwidth Lower cost – no duplicating services Unified communication systems – single infrastructure to manage Dual-mode phones…
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Telecommunication Providers
“IP Backhaul” – providing links between switching stations (exchanges) and connecting between providers. Some providers rolling out VoIP in place of standard telephony service.
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Consumer Market
Available since 2004. Delivered by existing broadband connection. Behaves much like standard Public Switched Telephone Network (PSTN). Requires equipment: Dedicated VoIP phone, or Adaptor for standard analog phone, or Software and headset/web cam Benefit for home users is ability to make free phone calls, especially when making long distance calls. Most common provider is Skype.
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SIP Components
User Agents: End system acting on behalf of user e.g. client & server. Initiates SIP request & server receives requests and returns responses on behalf of user. Network Servers: Three types available: Registration server – receives client location updates. Proxy server – forwards receiving request to next-hop server. Redirect server – determines next-hop server, returns…
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