SIP Broker is a non-commercial Voice over IP

Voice over IP

Voice over Internet Protocol is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communications and multimedia sessions over Internet Protocol networks, such as the Internet...

 network company owned by H.A. Enterprises Pty Ltd.

SIP Broker is a free service that improves a SIP

Session Initiation Protocol

The Session Initiation Protocol is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol . The protocol can be used for creating, modifying and terminating two-party or multiparty sessions...

 telephone service by:

ENUM

Enum

ENUM or enum may refer to:* E.164 NUmber Mapping, a suite of protocols to unify the telephone system with the Internet* An enumerated type, a data type consisting of a set of named values...

 with automatic PSTN fallback

People who have a PSTN phone (or a DID

Direct Inward Dialing

Direct inward dialing , also called direct dial-in in Europe and Oceania, is a feature offered by telephone companies for use with their customers' private branch exchange systems...

) can map that phone number to a SIP URI

Uniform Resource Identifier

In computing, a uniform resource identifier is a string of characters used to identify a name or a resource on the Internet. Such identification enables interaction with representations of the resource over a network using specific protocols...

 (for free at e164.org, but no new registrations - project is abandoned)-- that mapping is called ENUM. Whenever someone calls that PSTN phone number from a SIP client or proxy that checks ENUM, the call goes to the mapped SIP URI (rather than via PSTN) and is free.

With SIP Broker, if an ENUM entry is not found, then the call is sent back to the SIP adapter, which then places the call in exactly the same way as if SIP Broker had never been involved. So if a SIP adapter is registered with a prepaid SIP-to-PSTN gateway (like SIPphone or OZtell), then the call will continue regardless if SIP Broker was able to find an ENUM entry.

SIPdomain-to-numericPrefix mapping

Dialing a direct URI can be difficult since phone keypads do not usually include characters other than numbers. SIPbroker maps 'fwd.pulver.com

Free World Dialup

FWD is a Voice over Internet Protocol network and business venture owned by Pulver.com, Inc. and founded in 1994 by Jeff Pulver, Brandon Lucas, and Izak Jenie....

' to '*393', so you would just dial '*393613'.

Providers Peering with SIP Broker