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SIP Broker
SIP Broker is a non-commercial Voice over IP network company owned by teamburns.com.〔(【引用サイトリンク】title=Free service unshackles VoIP users )〕
SIP Broker is a free service that improves a SIP telephone service by a number of innovative features.
==ENUM with automatic PSTN fallback==
People who have a PSTN phone (or a DID) can map that phone number to a SIP URI (for free at (e164.org )) – 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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