VoIP Cookbook: Peering Among Providers
There are actually plenty of free services like VoIPRakyat across the world. Most of these services are interconnected through a broker facility run by a SIP Broker http://www.sipbroker.com. SIP Broker functions as an SIP internet exchange where all SIP account providers share their traffic. SIP Broker provides area code for each of them, allowing them to be connected to each other. In short, those who have account in VoIP Rakyat can also communicate with others who own account in different servers.
A complete list of more than a thousand of a variety of SIP account providers worldwide can be found in the SIP Broker's white pages from the following URL:
http://sipbroker.com/sipbroker/action/providerWhitePages.
Notice that there are some important information on the providers, such as, Provider Name, some with their URL; SIP Proxy, the SIP server in use; Area code, or better known in SIP Broker terminology as SIP-Code. Also listed in such a list is VoIP Rakyat's area code, which is *536. This means that other SIP providers willing to connect to VoIP Rakyat have to add the *536 code as a prefix preceeding VoIP Rakyat's SIP account number. For example, if a SIP provider wishes to call someone in VoIP Rakyat whose SIP account number is 20123, then user of such provider should dial *53620123 instead of 20123.