VoIP Cookbook: Becoming a Peer in SIP Network
If you're operating your own softswitch using the public IP address, you can register with SIP Broker for free in order to obtain the area code of the SIP Broker so that you can be called by other VoIP network. The procedure you have to do is as the following: create an account in SIP Broker at http://www.sipbroker.com/sipbroker/action/memberRegister, and register your SIP Proxy through SIP Broker at http://www.sipbroker.com/sipbroker/action/providerWhitePages. Enter your SIP Proxy in the provided blanks and click the Save button.
The process of creating an account at SIP Broker is not difficult. All you have to do is to select the menu for member registration.
In the member registration menu, you only have to enter the information pertaining to the SIP URL (such as 20123@voiprakyat.or.id), the password, e-mail address to register yourself to the SIP Broker through http://www.sipbroker.com/sipbroker/action/memberRegister.