Service providers are the companies that provide the bandwidth to make internet calls. Instruments or the hardware necessary to make calls are often provided by them or need to be leased out from them. Though regular phones can also be modified to make internet calls with the help of an adaptor, most service providers promise better connectivity and voice clarity through the usage of instruments provided by them. VoIP service providers often charge a fixed fee per month and allow unlimited local calls. For international calls, the duration of the call is often a limiting factor and billing is done based on the duration of the call.
While VoIP services are available in most countries and calls using this technology can be made to anywhere in the world, it would be good to check with your service provider for the geographies he offers services to and also a tariff card to make you aware of the cost of each call. Since VoIP phones work based on the internet connectivity; in case of power outage or if the internet goes off, it would not be possible to use VoIP phones. It would not be possible to even make emergency calls with VoIP phones in case of power and internet outage.
The author of this article works with Breezecom which is associated with wholesale VoIP termination services in the Indian subcontinent and the Middle East.
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