- Indicates the Communication Service Provider (CSP) responsible for this number AKA the “carrier-of-record” or “ITAD identifier”
- Potential uses:
- Optimize routing
- Advising end-users about costs when charging depends on the terminating CSP
- Targeted to public and private Infrastructure ENUM
- Internet-Draft under development
Indication about how much this number will be charged:
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In particular useful for premium rate numbers
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Targeted to public Infrastructure ENUM
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Challenge: The usefulness of such information is often degraded outside the operator or country in question
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- Returns the Calling Name (like directory name) for a given phone number.
- Used in cases where this information is not available or lost:
- Calls that originate on (or transited via) the Public Switched Telephone Network (PSTN)
- Calling Name to be displayed on VoIP or other Real-time Clients
- Targeted to public and private, Infrastructure and User ENUM
- See: draft-ietf-enum-cnam-08
- Indicates whether an E.164 number (or number range) is allocated or assigned for communications service.
- Lets client know that a call will fail without wasting the effort of a session setup E2MD lookup is faster than SIP INVITE
- The user can be provided with a correct announcement (or other indication)
- Targeted to public and private Infrastructure ENUM
- See: draft-ietf-enum-unused-04
- Increases efficiency of overlapped dialing
- Reduces DNS lookups and SIP INVITEs
- Decreases frequency of timeouts
- Could extend SIP "484 address incomplete" handling: no need for a new SIP dialogue for each dialed digit
- Deployed in empty non-terminals (i.e. in the branches)
- Indicates the minimum depth of the tree below this record
- "You must send N more digits before any leaf-node NAPTRs will be returned"
- Designed for private ENUM, but works also in public ENUM
- Targeted to public and private Infrastructure ENUM
- See: draft-bellis-enum-send-n-02
- SMS | MMS | video calls | presence | IM | …
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- Pre-Paid | Post-Paid | ...
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- TDMA | GSM | 3G | …
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- Numeric value indicating a region within a country
- Least cost routing information
- e.g. preferred gateway
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The content of this page was last updated on 2010-07-10. It was migrated from the old Trac wiki on 2023-02-26.