Phone cards are a great relief for businessmen looking out to curb the extra expenditures on phone calls. Big organizations are always on a look out for better network of connections that facilitate quality calls at reasonable rates. On account of these reasons, phone cards hold importance for all sorts of business communications.
Business travelers also largely benefit through phone cards. They are saved from the trouble of paying huge bills with excessive roaming charges.
Making calls is an integral part of any business. No business can run without phone calls. Hence phone cards solve this purpose very effectively through welcoming rates and simple use. The cheap rates, the contract-free processing and easy availability accompanied with a wide range, together make phone cards an excellent option for business. Read more…
The main open issue is the inability to properly handle Skype, to date probably the most widespread VoIP protocol. As explained before, this is due to the lack of documentation about the protocol, and the use of payload encryption. This is not only a limitation of ntop and nProbe but of any other VoIP analysis tool.
VoIP support is relatively new into ntop/nProbe hence several extensions can be added to their implementation. The current measurements focus mainly on high-level metrics such as jitter or packet loss, and are independent of the codecs being used. However as new codecs such as H.264 [h264] are becoming increasingly popular, a planned enhancement is the ability to decode some of these codec formats in order to also provide precise information about the RTP payload (e.g. voice quality), as well provide support for RTP XS reports.
The implementation of these voice analysis metrics has been delayed with respect to the original plan, as they are described in ITU documents (e.g. ITU E.411 recommendation) that are not freely available on the Internet, that is usually a problem for the open source community. Nevertheless in the next release two new common metrics such as MOS score and r-factor will be implemented thanks to bits and pieces found googling on the Internet.
Source: Luca Deri (ntop.org)
For the convenience of those who frequently make International Calls, the systems of Phone Cards have been introduced by various service providers. By purchasing this, the caller would have actually paid for the calls he would make within Card’s validity. Soon, the caller will be assigned a PIN number. Once he makes a call, the call charges automatically gets deducted.
The Phone Cards are available at places where the person visits frequently. Now, these can be purchased online as well. This would particularly benefit those who make frequent travel or for those who want to make international call while in travel.
Buying Phone Cards online is very easy. There are many service providers. One has to just access the website of these service providers. Once, the service provider is selected, he has to enter certain information. Read more…
Many people suppose that prepaid calling cards are good as it charges per – minute rates, which is actually cheaper than postpaid calling cards. Prepaid cards are already loaded with specific monetary value, which can be used to call people at anytime. This gives the user in control his or her phone expenditure.
Another thing that makes prepaid calling card more attractive is that people can still make calls that are not internationally enabled, which means that you can still stay in touch with your family, friends or some business partners who are living anywhere in the world without making any agreements and waiting for phone bills at the end of each month. You can easily make a call from your friend’s house, home or even from your office. Read more…