The following 9L0-509 section is quite technical, as it deals with complicated infrastructure and the integration of VoIP into core internet technologies.
The ENUM protocol (described in RFC document ) translates standard telephone number routing (known as E.164, as the ITU defines the standard by which telephone numbers are assigned in 9L0-402 study guide the E.164 standard) into an addressing scheme able to route to VoIP (eg. SIP/H323) gateways using DNS technology.
ENUM technology allows VoIP servers to use the DNS infrastructure to query routing paths for terminating voice calls given a phone number.
When a call is 9L0-509 initiated to a given phone number, a VoIP gateway capable of ENUM service will query the provided number in DNS to determine whether there is a path other than the PSTN line available to the destination service.
This allows providers to advertise paths via VoIP to services otherwise only available via a VoIP to PSTN gateway.
ENUM records 9L0-402 audio exam may contain other information in addition to a VoIP gateway address, such as a web URL or e-mail address.
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