At the beginning a little history about telephony
I am IT engineer and I work also in IP telephony. I decide to write this article based on experience from the field
where users asks me, why I replace old phones and what will be advantage on new IP phones. I find the
explanation of SIP or H.3232 technology is very difficult to understand, especially for people over 50′s and
I decide to find a way to explain that could understand anybody.
where users asks me, why I replace old phones and what will be advantage on new IP phones. I find the
explanation of SIP or H.3232 technology is very difficult to understand, especially for people over 50′s and
I decide to find a way to explain that could understand anybody.
At the beginning a little history about telephony:
We are familiar with telephones from long time ago, exactly from year 1870. The first inventor Alexander
Graham Bell designed devices that could transmit speech electrically (the telephone).
Graham Bell designed devices that could transmit speech electrically (the telephone).
In the mean time till today happened a lot of new things on the telephones. After the invention of mobile
phones we thought nothing new could be invented.
phones we thought nothing new could be invented.
But, there is always something that we can make better. If not better it could be cheaper. And IP telephony
(VOIP – Voice over IP protocol) can make calls very cheap in some ways also free of charge. And what is the
difference at IP telephony vs. »classical -PSTN« telephony? We don’t need to connect our phones to special
outlet and service provider don’t need to place additional wire to our apartment. We can use pair of wire or
much better fiber optic connection for telephony, TV and internet connection. This is view from user site,
but if we are looking from provider site, we can see big difference in technology.
(VOIP – Voice over IP protocol) can make calls very cheap in some ways also free of charge. And what is the
difference at IP telephony vs. »classical -PSTN« telephony? We don’t need to connect our phones to special
outlet and service provider don’t need to place additional wire to our apartment. We can use pair of wire or
much better fiber optic connection for telephony, TV and internet connection. This is view from user site,
but if we are looking from provider site, we can see big difference in technology.
Now we find what is media used for IP telephony (VOIP – Voice over IP protocol) and the next question if we
already have internet connection is what IP telephone to buy. Do we really need new telephone or we can use
old one? I believe that everybody wants new phone, because people likes new things. But there are still a few
people who like their old phones. Inventors find solutions for them too, which is called media converters.
already have internet connection is what IP telephone to buy. Do we really need new telephone or we can use
old one? I believe that everybody wants new phone, because people likes new things. But there are still a few
people who like their old phones. Inventors find solutions for them too, which is called media converters.
Media converters convert our voice from analog signal to digital and this one is converted to IP world. The box
where we connect old phone on one site and the internet on the other site we call media gateway. Simple!!!
Not really, but in this article we will not explain in details how technology works. It is important that you
understand basics. IP telephone we can connect directly to the internet and it should work. And here is first
advantage. If you travel to different places around the world, you can take your phone with you. Practical?
No of course not. But most people today travel with notebooks and notebooks are usually connected to internet.
Another solution and advantage of IP telephony (VOIP – Voice over IP protocol) is soft phones. This is software
installed on your system and this software act like phone. Another good thing is that we can find on the internet
software for free. Software for free, calls almost for free( like you call from own country) , you can forward your
calls also to mailbox… everything one big advantage.
where we connect old phone on one site and the internet on the other site we call media gateway. Simple!!!
Not really, but in this article we will not explain in details how technology works. It is important that you
understand basics. IP telephone we can connect directly to the internet and it should work. And here is first
advantage. If you travel to different places around the world, you can take your phone with you. Practical?
No of course not. But most people today travel with notebooks and notebooks are usually connected to internet.
Another solution and advantage of IP telephony (VOIP – Voice over IP protocol) is soft phones. This is software
installed on your system and this software act like phone. Another good thing is that we can find on the internet
software for free. Software for free, calls almost for free( like you call from own country) , you can forward your
calls also to mailbox… everything one big advantage.
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