* You should first define the kind of calls you are most likely to make. National or international, on the net or local are the choices. Once you know this fact you will be able to compare voip providers and call costs to work out which one would suit your phone usage best.
* Another criterion in choosing voip providers is to decide which features you will need in your voip system. For instance you might want caller ID, voicemail or a PSTN gateway for outgoing calls.
* You also need to look at the cost of local calls from your voip providers. Any that connect with the major carriers are likely to offer the cheapest rates.
* Your voip providers cannot usually control the quality of sound since much depends on what kind of device you have and what device is at the other end. However if calls to PSTN numbers are made the connection is via high quality connections.
* It is also important to realise that some voip providers lock their voip devices so that you cannot switch to another provider.
Don’t forget that voip phones do not offer emergency call numbers or the ability to make calls when the power is out, so you do need another landline or mobile phone.
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