These are the best VoIP programs to free phone or with low cost over Internet:

1. Skype www.skype.com

One of the best programs to become called VoIP for other fixed or cellular computers, phones. Better characteristic its is, without a doubt, the compatibility with other products due to the fact to have been the first used program for the accomplishment of VoIP calls.

It makes possible:

1. To carry through linkings of computer for computer
2. To carry through called for fixed and cellular telephones
3. To receive telephonic linkings in the computer through the SkypeOut
4. To use the mobile VoIP thanks to other instruments as the ISkoot or the VoIP enabled to cellular as NetGear SPH101

Advantages: Compatibility and portabilidade through complementary instruments.
Disadvantages: The tariffs charged for the competitors start to be lesser.


2. VoipStunt

One of the first competitors of the Skype. The VoipStunt introduced gratis called VoIP for fixed telephones in many countries. It has tariffs lower than the Skype and, in addition, if he uses of protocol SIP, which allows to also use normal telephones.

Advantages: Absolutely competitive had to the linkings, exclusive for registered users.
Disadvantages: I tried to make some calls for cellular telephones: some times, in experimental way (trial mode), I did not obtain to complete the linking.


3. Jajah www.jajah.com

In the war of the internet free calls, Jajah was the first one programs to allow to telephone way Internet using (without computer). To make a call we only have to type our phone and the destiny phone in the Home Page of the Jajah website and to wait for a answer on the other side.

Advantages: It is not necessary software and it can be carried through gratis called for some countries.
Disadvantages: A telephone is necessary, is not allowed to make linkings between computers.


4. Gizmo Project www.gizmo5.com

Gizmo Project is trying to get its proper space in the VoIP market and offers free calls VoIP for fixed and cellular telephones. Free calls are only allowed for registered users.

Advantages: Calls between users absolutely free, only for registered.
Disadvantages: The quality of the linkings seems not to be so good.