Advantages and Disadvantages of VoIP phone

VoIP phones are becoming more and more popular and widely used. But what is the Advantages and Disadvantages of VoIP phone?

Advantages of VoIP phone

1. Low cost. You can make calls at very low prices. Using VoIP phone can reduce communication and infrastructure costs. As VoIP phone calls over existing data network (WiFi or Internet), so there is no need to separate voice and data network.

2. Flexibility. You can make call anywhere. VoIP phone calls can facilitate tasks over the same broadband connection and is location independent - only an Internet connection is needed to connect to the service provider.

Disadvantages of VoIP phone

1. Quality of service. As VoIP calls are made over IP network, it may cause packet loss and delay, so the quality is not so good, but many improvements have already made, and it's quite clear now.

2. Susceptibiliey to power failure. IP Phones and VoIP telephone adapters connect to routers or cable modems which typically depend on the availability of mains electricity or locally generated power. But some service providers use customer premise equipment (e.g., cable modems) with battery-backed power supplies to assure uninterrupted service for up to several hours in case of local power failures.

3. Emergency calls. The nature of IP makes it difficult to locate network users geographically. Emergency calls, therefore, cannot easily be routed to a nearby call center.

4. Number portability. A fixed line can easily achieve number portability by maintaining a database of numbers. But it's not so easy for VoIP phones.

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What is VoIP phone

What is VoIP phone

VoIP, short for Voice over Internet Protocol, in contrary to the traditional public switched telephone network, is a term for delivery of voice communications over IP networks.

There are three types of VoIP phone services:

1. Use an analog telephone adaptor (ATA) to connect between an existing telephone jack and the IP networks. This type of service is fixed to one location and is offered by broadband internet providers at a cheaper flat-rate plan.

2. Dedicated VoIP phone which allow VoIP calls without the use of a computer. However it is connected directly to the IP network (WiFi or Ethernet).

3. The user can install VoIP software on their computers that allow VoIP calling without dedicated hardware. And you can move to any country or location.

For more information about VoIP phone, please go to: What is VoIP phone.

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How to set up wifi on Symbian mobile phone

Basically, it's very easy to set up wifi on Symbian cell phones. For most Symbian s60v3 mobile phones equipped with wifi, you just need to search wifi hotspots. Once find a open public hotspot, you just set it as access point.

When you open a browser or other programs that need internet connection, select the wifi access point. Then your browser will use wifi connection to connect the internet.

However you may not succeed in connecting to the wifi network. And sometimes the wireless network are encrypted or have MAC address filtering enabled, or DHCP is disabled, in this case, things become much more complicated.

If DHCP is disabled, you need to find the right IP for your mobile phone. If MAC address filtering enabled, you need to find the MAC addresses allowed. If encrypted, you need to find the keys.

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Change MAC address to gain shared internet connection

As I said in the previous post, China telecom has strict restriction on multi-pc internet connection. Evidently the increase in broadband internet user slowed down, so is the revenue. I think that's why it does not allow more than one pc to connect to internet.

We will use the second way to hack it: change the MAC address. But before we begin, I would like to say, this may pose certain risk on China telecom users as many hackers would use this to steal others account.

When you create a broadband account with China telecom, it bind the account with your mac address. So even if you know other's account and code, you could not have free internet connection. But if you get the MAC address associated with the broadband account, now you DO have free internet.

Considering this, I will not elaborate on the process because someone would steal others account.

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Hack China telecom's internet connection to gain shared access

I have an internet account with China telecom with a speed of 1M, but China telecom charge me top dollar, what makes me really angry is that only one pc is allowed to connect to internet. I have a neighbor who has the same issue with China telecom, so we decided to hack this one-pc-allowed restriction internet connection.

He has a wireless router with four ports and a desktop, I connected my laptop to the wireless router port, and enabled DHCP. His desktop was connected to internet earlier. Well the irony is that, the moment I connected my laptop to the router, a shared internet connection set up automatically, and I typed http://www.google.com/ in the address bar, you know what? It works!

So China telecom's restriction was removed so easily, I can hardly believe it. When I called China telecom's customer service earlier, she told me: no way, you can use it only for one pc, lol.

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