Now here is a book which you may find interesting as well as useful if you are using VoIP in your business and home.

Practical VoIP Security

Here is what is covered in the book:

Voice Over IP (VoIP) phone lines now represent over 50% of all new phone line installations. Every one of these new VoIP phone lines and handsets must now be protected from malicious hackers because these devices now reside on the network and are accessible from the Internet just like any server or workstation.

This book will cover a wide variety of the publicly available exploit tools and how they can be used specifically against VoIP (Voice over IP) Telephony systems. The book will cover the attack methodologies that are used against the SIP and H.323 protocols as well as VoIP network infrastructure. Significant emphasis will be placed on both attack and defense techniques. This book is designed to be very hands on and scenario intensive. Read more about Practical VoIP Security

How A WiFi Cell Phone Works

The way a WiFi cell phone works is that it will connect up to a local available wireless network then use some other service to make a voice over IP connection to the phone number. What this means is that any calls you make will be completely free of charges from the cell phone company because you are not using their service at all. While the quality of these WiFi cell phone calls may not be as high as what you would see using your normal cell phone, they are more then adequate for making calls on a regular basis when you simply need to talk and do not want to pay much for it.

Voice over IP will usually have a bit more lag than a normal to cell phone connection, but for the most part this is not significant. The key is that you need to make sure that are able to run service on your phone to use the WiFi connection to talk. Some may not have the ability be a WiFi SIP phone, Skype or any of the other programs that are available. In addition the strength of your connection will be dependent on a couple of factors.The first is the quality of the wireless in the WiFi cell phone. I would recommend if you intend to use your cell phone for this making absolutely sure that it has at least wireless G. Wireless N would be great, but those phones can be incredibly expensive.

This will ensure not only that you have the throughput to make the call but also that you have a good quality signal strength and range to make it reliable.Voice over IP does not require a huge amount of bandwidth so the more important part is that you have a nice strong single and you are not getting disconnected frequently.By getting at least a G phone you can make sure that this will be the case.

There are some things you may not be able to do with a WiFi cell phone.The first of which is receive calls. While you will be able to get incoming Skype requests, to get an incoming call form a land line will be a problem.It is however a good tool for making calls.

For more information please visit my WiFi Security Camera Website.