IMS ENUM and DNS Mechanism
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This document discusses IMS ENUM and DNS mechanisms for mapping telephone numbers and SIP URLs. It contains the following information: 1. ENUM is defined as the E.164 Number Mapping that provides a system to unify telephone numbers with Internet addressing by mapping E.164 numbers to URIs like SIP. 2. When a UE invites another party using a SIP URL, DNS is used to resolve the URL to an IP address. But for TEL URLs, DNS cannot resolve it so ENUM is used to map the TEL URL to a SIP URL which can then be resolved. 3. If ENUM query for a TEL URL succeeds, the TEL URL is mapped to a SIP URL which
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![ENUM Definitions
ENUM = E.164 Number Mapping
Telephone number mapping is a system of unifying the
international telephone number system of the public switched
telephone network with the Internet addressing and
identification name spaces.
The E.164 number to URI DDDS (ENUM) application provides a
mapping from E.164-based "names" to various URIs, including SIP,
as defined in [RFC3761];](https://image.slidesharecdn.com/imsenumanddnsmechanism-140808022535-phpapp01/85/IMS-ENUM-and-DNS-Mechanism-5-320.jpg)
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- 1. IMS ENUM and DNS Mechanism IP Multimedia Subsystem Series
- 2. E.164 Definitions The international ITU-T E.164-number for geographic areas is composed of decimal digits arranged in two code fields: the country code (CC) and the national (significant) number N(S)N. The national (significant) number may be further subdivided into national destination code and subscriber number fields, according to national requirements. CC NDC SN 1-3 digits Max (15-n) digits National Number Max 15 digits ITU-T E.164 number for geographic areas
- 3. SIP URL P-CSCF UE (A) S-CSCF AS I-CSCF TriggerA Party Services DNS Invite (SIP URL: B@domainB) Invite (SIP URL: B@domainB) Invite (SIP URL: B@IPAdd) IPAdd
- 4. TEL URL P-CSCF UE (A) S-CSCF AS I-CSCF TriggerA Party Services DNS Invite (TEL URL: B) Invite (TEL URL: B) IPAdd DNS cannot resolveTEL URL
- 5. ENUM Definitions ENUM = E.164 Number Mapping Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces. The E.164 number to URI DDDS (ENUM) application provides a mapping from E.164-based "names" to various URIs, including SIP, as defined in [RFC3761];
- 6. TEL URL (ENUM query success) P-CSCF UE (A) S-CSCF AS I-CSCF TriggerA Party Services ENUM Invite (TEL URL: B) Invite (TEL URL: B) TELURL SIPURL Invite (SIP URL: B@IPAdd) IPAdd DNS DomainB IPAdd
- 7. TEL URL (ENUM query fail) P-CSCF UE (A) S-CSCF AS BGCF TriggerA Party Services ENUM Invite (TEL URL: B) Invite (TEL URL: B) TELURL Fail Invite (TEL URL)
- 8. thank you