Wednesday, October 20, 2010
I hope you are familiar with the IP address thingy. VoIP is using latest generation IP addressing and it is converting our phone number to an IP address and then routing that information using the destination address and then again converting back to phone numbers. Likewise you use codes like 001-789-4566664. This is the format for a phone number, but when it is converted to an IP address, it is something of this sort, 220.127.116.11 I hope you are getting a picture and all this conversation is being done using a gatekeeper which handles all the traffic and routing and conversions. You should try searching some material about it on the net or on my hubs.
You should get a hands on the rate at which compression of data is being done. For example if you phone lines are working at 64kb/sec, they are not efficient to send data at this size and normally what a good solution requires is some data compression. You can compress a data packet to a max of 8kb/sec and in technical terms it is called G.729. G.728 (16kb/sec_.G.727(32kb/sec) and so on... The present telephony structure is using H323 protocol. but what I am working on is a conversion of H323 protocol to H248 and get some knowledge about H321..H322.. H323.. H324..H325 ..H245.... There are some protocols like SIP (session initiation protocol). When you will start your search using a VoIP, you will come across all these terminologies and I have explained most of them in my articles.
ADVANTAGES OF VOIP
Traditional phone calls set up a circuit between caller and callee and some points of concern are:
1) 50% of the line is continuously idle (because either you are talking/other person is talking, but NOT both at same time).
2) Lot of silence is present.
So VoIP is better as it sends packets only when there is a need to send voice. Therefore Resource Utilization is CUT by about 70%!
3) Ordinary Telephone sends 64Kbps. But VoIP does a lot of compression.
And many other such features.
DISADVANTAGES OF VOIP
3) Lack of QoS in Public Networks
But these are fast fading and VoIP is emerging as the communication protocol of choice in long-distance voice communications. Actually VoIP is where Telecom Networks and Data Networks intersect.
Telecom companies want to do VoIP their way - H.*** protocols are that suite. (Intelligence in the network is what they believe). They say that we are around for over 100 years, so we have the most tested tech kinda stuff.
Data Networking (IETF etc) wants to use SIP suite of protocols. (Intelligence in the End‑Points is what they believe). They show the rapid development of Internet kind of stuff to support their views.
PS: Do NOT confuse "intelligence" above with the standard "intelligence" we use. In this context, intelligence is about who is taking the decisions, etc.
Now I think you are able to understand what is VOIP and its advantages and disadvantages.VoIP Phones - Use of signaling protocol, call manager, and SIP clients