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Infrastructure ENUM ETSI TR 102 055 ENUM Workshop November 2004. Richard Stastny, ÖFEG*. * The opinions expressed here may or may not be that of my company. What is ENUM?. A protocol defined by IETF in RFC 3761

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infrastructure enum etsi tr 102 055 enum workshop november 2004

Infrastructure ENUMETSI TR 102 055ENUM WorkshopNovember 2004

Richard Stastny, ÖFEG*

* The opinions expressed here may or may not be that of my company

Richard Stastny

what is enum
What is ENUM?
  • A protocol defined by IETF in RFC 3761
  • ENUM is a database in the DNS used to find services (URIs) related to E.164 numbers in a well defined domain (e164.arpa)
  • It is therefore:
    • based on IETF principles
    • a service on the (public) Internet
    • end-to-end
    • end-user opt-in (calling and called)
  • Because ITU-T and national E.164 resources are used, it is also:
    • national opt-in
  • Carriers, operators, service providers,…
    • have no say in ENUM

Richard Stastny

what is required by carriers
What is required by Carriers?
  • If carriers want to interconnect (peer)
    • using IP-based technology
    • and E.164 numbers,
  • they have to use something else (e.g. another database)
    • to route calls within their networks
    • or to route calls between networks
  • If this other database is using ENUM technology, some name it
    • Carrier “ENUM”
    • Infrastructure “ENUM”
    • Operator “ENUM”
    • Enterprise “ENUM”
    • Corporate “ENUM”

Richard Stastny

carrier internal use
Carrier Internal Use
  • Carriers may use ENUM technology to find within their network
    • the VoIP servers hosting their subscribers
    • Interworking servers (e.g. SIP/H.323)
    • the egress border elements to other IP-based networks
    • the egress gateways to PSTN-based networks
  • The ENUM database may also
    • interwork with existing IN (NP) databases
    • may be provisioned from the same administrative database
  • The root of the database may be in any domain
  • the administration of the database is carrier internal matter

Richard Stastny

carrier shared use
Carrier Shared Use
  • Any con-federation of carriers may use ENUM technology to find
    • the ingress border elements of the other IP-based networks
    • not end-to-end, but network-to-network
  • the shared DB may either be in a
    • IP-based network shared between carriers (extranet)
    • or on the Internet (e.g. e164.info or even DUNDi)
  • The root of the database may be in any domain
  • the administration of the database is a con-federation internal matter (no regulators involved)
  • in the rare case that all carriers agree to use a common shared database on the Internet
    • an implementation in .arpa (e.g. e164c.arpa) is recommended

Richard Stastny

is co existence possible
Is co-existence possible?
  • to be reachable via ENUM, an end-user needs a URI resolvable on the Internet (e.g. SIP AoR), provided:
    • by himself (DIY)
    • by his corporation
    • by a virtual VoIP provider
  • a carrier hosting a subscriber with an E.164 number within his network MAY provide this subscriber with an URI (or he may not)
  • if this is the case, the user may be reachable both via ENUM and the carrier database
  • the carrier may also lookup ENUM on behalf of his subscriber first, then lookup the carrier database(s) and finally may route the call via the PSTN
  • so ENUM may co-exist with other routing mechanisms

Richard Stastny

some voip scenarios
Some VoIP Scenarios

DNS

ENUM

Internet

DB

NGN A

NP

DB

PSTN

DB

NGN B

Richard Stastny

from the internet
From the Internet

tel:+xxx

DNS

ENUM

sip:user@host

sip:user@host

Internet

sip:user@host

tel:+xxx

tel:+xxx

DB

NGN A

tel:+xxx

NP

tel:+xxx

DB

PSTN

tel:+xxx

DB

tel:+xxx

NGN B

Richard Stastny

from the pstn
From the PSTN

DNS

ENUM

sip:user@host

Internet

tel:+xxx

tel:+xxx

ENUM number range

DB

NGN A

tel:+xxx

NP

tel:+xxx

DB

PSTN

tel:+xxx

DB

tel:+xxx

NGN B

number range or ported

Richard Stastny

from the ngn
From the NGN

DNS

ENUM

sip:user@host

Internet

tel:+xxx

tel:+xxx

ENUM number range

DB

NGN A

tel:+xxx

NP

tel:+xxx

DB

PSTN

tel:+xxx

DB

tel:+xxx

NGN B

number range or ported

Richard Stastny

walled gardens current tispan plan
Walled Gardens – current TISPAN plan

Internet

TISPAN NGN

GSMA GRX

PSTN

Richard Stastny

walled gardens possible solution
Walled Gardens – possible solution

Internet

TISPAN MoU

GSMA GRX

PSTN

Richard Stastny

the end
The End

Thank you

Richard Stastny

ÖFEG

+43 664 420 4100

richard.stastny@oefeg.at

Richard Stastny