30-days Money-Back Guarantee
Comprendre le fonctionnement du protocole ENUM et les schémas d'interconnexions entre Opérateurs Télécoms
Updated on Sep, 2026
IT and Software , Network and Security,
Training 5 or more people ?
Get your team access to 10000+ top Tutorials Point courses anytime, anywhere.
Like DNS, which resolves between a domain name and an IP address, the ENUM protocol allows you to find a server name from a telephone number in E.164 format.
It is used in interconnection architectures between Service Providers.
It is in reality responsible for the signaling induced from the dialing of the called number until the discovery of the NS (name server) of the SIP server responsible for the called number, and this is where all the beauty of this protocol lies in its operation for telecom purists.
We therefore offer you this module entitled 'Carrier peering: SIP and ENUM' which explains all the possible details on the operation of the ENUM protocol.
The interest of this module is that it focuses on two types of DNS records, essential for telephony, namely NAPTR and SRV.
From ENUM requests to responses including the "e164. arpa" tree and the sequence of different DNS records, this module is very well designed to not only give the participant a good understanding of how the ENUM protocol works, but also show him the benefit of implementing this protocol in modern telephony architectures.
Furthermore, it should be noted that ENUM, by its nature, gives players such as businesses and telecom operators the possibility of entering into interconnection agreements in order to facilitate the exchange of traffic.
This module therefore presents to you in a second phase the different interconnection schemes between telecom operators.
Thus, it addresses peering scenarios more generally, and more particularly the call routing strategies defined in the IP-NNI recommendations, thereby providing a good basis for analysis to engineers who wish to do so. inspire to build interconnections with their partners.
Still in this 'interconnections' section, the module offers you some IP-NNI reflexes considered very useful in your interconnections.
The module is open to everyone (engineering students & professionals in the field) and goes into detail about the information to be imparted to participants.
• E.164 DIALING PLAN
• ENUM AND CALL ROUTING
• Statement of principle
• The domain “e164.arpa”
• OPERATION OF THE DOMAIN “e164.arpa”
• Example: PSTN to SIP UA
• NAPTR registration
• NAPTR AND DNS REGISTRATION
• SRV type recording
• IP TO PSTN (simplified)
• DIFFERENT ENUM TYPES
• Public ENUM and its limits
• BILLATERING PEERING
• MULTI-LATERAL PEERING
• DESCRIPTION AND ARCHITECTURE
• THE BENEFITS OF SIP NNI
• INTERCONNECTION LAYERS
• IP NNI trust model
• PAI and Diversion headers
• Portability (with 'rn', 'npdi' fields)
• SIP overload control
• RTP loopback extension
• SIP – Specific Details of IP NNI
• Normal SIP offer/answer model
• The different forms of the P-Early-media header
• The 'aggregate' approach
• Use of LERG and NPAC databases
• Provisioning & explanation
• Call flow IP to IP & explanation
• Call flow IP to PSTN & explanation
• Use of LERG as TIER2
• Call flow & explanation
•The 'per-TN' approach
• Callflow & explanation
• NPAC TIER1 ENUM registry
• INDEPENDENT ENUM TIER0/1
Mastery of the ENUM protocol in its operation
Understanding the DNS and ENUM tree (TIER0, TIER1, TIER2)
Understanding ENUM queries
Understanding NAPTR Records
Understanding SRV records
Understanding ENUM key formation
Understand the interworking and sequencing between NAPTR records and SRV records
Know the different interconnection/peering architectures between telecom operators
Understanding routing strategies between telecom operators
Know and understand the recommendations of the IP NNI
Check out the detailed breakdown of what’s inside the course
Use your certificate to make a career change or to advance in your current career.
Become a valued member of Tutorials Point and enjoy unlimited access to our vast library of top-rated Video Courses
Master prominent technologies at full length and become a valued certified professional.