The packing guide Introduction Of VoIP.
We saw one of the biggest questions that we have is, what exactly is a voice over IP and for lack of a better phrase is exactly as it sounds it is sending your voice over the internet but that is a vast oversimplification of course what is this really mean.
It is nothing less than changing everything about how we handle voice communications so we’re talking about different networks here we’re talking about different protocols different techniques different equipment everything is different different skill sets the only thing that is the same is that we are still gonna take our voice our voices and changed very much we’re still going to send it to somebody else and that someone has to be able to understand it and then communicate back to us but other than that other than those ideas everything is different.
Side by side comparison of VoIP
When we talk about traditional telephony a lot of terms pop up here and we have a whole other set of discussions on traditional telephony but we talk about things like circuit switching and local loop and tip and ring and pots and the fact that it’s the public switched telephone network or PSTN.
The protocols of the architecture
the governs this particular network
The protocols themselves. At least the most common ones are going to deal with are meant to be simple H. three two three skinny RTP a little. Word on Asia three two three that’s still an I. T. U. D. standard. If we follow the voice over IP conversation a little farther we get into something called the unified communications and that’s where we integrate messaging and email and presence and all those sorts of things we’ll talk about those later on.
One other big deals about voice over IP is that generally, it has a lower total cost of ownership although there are some gotcha is there we’ll talk about that too. We have a 911 is a big issue and of course instead of being on the PSTN we are dealing with the internet.
Now is a little side note remember that many of the companies that are involved in the PSTN are also involved in running connections and traffic on the internet. There is another way of looking at.
The two networks compare them side by side the top one here is the traditional telephony network and we start with the telephone and that goes to our Peavey acts or our central office the telephone switch and that connection all the way going down to the phone that’s what we might call our local loop it also might be a connection to a desktop unit. And these are typically analog and digital remember that when we’re talking about traditional telephony. Really talk about analog and digital connections. Peavey axes central offices all have a collection of technologies that used to interconnect probably one of the most popular is the T. one.
Again this is all covered by as a sub in the lower picture we can see that the topology looks very similar although of course, that’s just the way I drew it if you take a close look at what’s going on here we see that the voice over IP phone is actually connected to an Ethernet switch, in fact, they’re sometimes called Ethan as far. Taking the place of the traditional PBX is something called a call server although it is often referred to as a voice over IP yet and then, of course, all of the connection types are run by the protocol suite of TCP IP.
We just want to know here that while we’re separating many of the ideas there’s nothing at all that says they can’t be combined so for example a Peavey acts might service analog digital and voice over IP phones a company might have a TCP IP based connection going to the internet and run that over to you want so this is not to be interpreted as being exclusively one side or the other a lot of the technologies mix and match but there is one thing that’s absolutely different is that when you’re dealing with a boy we’re dealing with TCP IP and we’re dealing with traditional telecom we’re dealing with the public switched telephone network I. T. U. T. protocols and signaling system seven.
Well we’re gonna start talking about a voice over IP network we have to become conversant with some of the terminology so call server that is the thing that all of the nodes or the phones register with so you log in it connects to the calls or when you want to dial a phone number you’re typically talking to a call server how when you wanna talk offsite you’re talking to a concert for the signaling protocol the thing that allows you to talk to the call server the thing that allows you to down numbers register make requests that are the signaling protocol now there’s a corresponding signaling protocol in as a seven-two when we actually start talking and we’re taking our voice samples and putting them inside packets. That we use the transport protocol now voice over IP network is not a network that has its own set of protocols and that’s it there’s a lot of support that goes into it into this DHCP and TFTP and power over Ethernet are very common techniques that we use to keep a voice over IP network up and running.
Yeah I’ve got gateways down here gateways have a connotation the networking world in this case what we’re talking about is something that understands how to talk to another type of voice over IP network or the traditional network so it’s very common for a gateway to understand TCP IP and the voice over IP protocols on one side and then understand signaling system seven on the other.