ENUM (For Dummies) - MSF

ENUM (For Dummies)

Spring VON, March 2007 Jim McEachern, Nortel

ENUM Considerations • Access • Public DNS (e164.arpa) or Private? • Content • Target URI (AoR) or Interconnection URI? • Control of content • End user opt-in & control, or carrier control? • Routing decision • originating end user, terminating end user, or carrier? Copyright 2006: MultiService Forum

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ENUM: What is important?

Public (e164.arpa)

User ENUM

Infrastructure ENUM

Private

Private ENUM

Infrastructure ENUM?

Target URI

Interconnect URI

Copyright 2006: MultiService Forum

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Who is in Control?

Public (e164.arpa)

Private

End User User opt-in ENUM

Private ENUM

User URI Copyright 2006: MultiService Forum

Infrastructure ENUM

l o r t n o C r e iInfrastructure r r ENUM? a C Interconnect URI 4

ENUM for Dummies Provision Provision Data Data

Telephone Telephone ## (E.164) (E.164)

ENUM

URI URI e.g. e.g. sip:[email protected] sip:[email protected]

ENUM is a database … Copyright 2006: MultiService Forum

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The Many Flavors of ENUM • User ENUM • Infrastructure ENUM • Private ENUM • Enterprise ENUM • ENUM to enable new business models


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The Many Flavors of ENUM • User ENUM • Infrastructure ENUM • Private ENUM • Enterprise ENUM • ENUM to enable new business models


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User ENUM for Dummies End-user control Provision Provision Data Data


ENUM

URI URI e.g. e.g. sip:[email protected] sip:[email protected]

Public DNS Copyright 2006: MultiService Forum

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User ENUM vs. SIP User ENUM query can return a single response, or multiple responses, with priority indicated. sipping WG (RFC 3824) recommends returning a single SIP address-of-record, and letting SIP mechanisms deal with priorities, capabilities, preference, presence & redirection. User ENUM allows multiple entries, including priorities and capabilities.

SIP, H.323, mobile, messages, email, etc. can even return another E.164 number duplicates functionality in SIP no consensus on which should be used User ENUM provides user preferences for being reached

hints to help the caller decide where to direct the call nothing requires the caller to follow those preferences Copyright 2006: MultiService Forum

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User ENUM for Routing? ENUM SIP Proxy

SIP Proxy

? SIP Client A

? Carrier B

Carrier A

SIP Client B

Internet

? User ENUM cannot provide routing Copyright 2006: MultiService Forum

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ENUM Flavors • User ENUM • Infrastructure ENUM • Private ENUM • Enterprise ENUM • ENUM for new business model


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Infrastructure ENUM for Dummies Carrier control Provision Provision Data Data

interconnect point Telephone Telephone ## (E.164) (E.164)

ENUM

URI URI

Public DNS? Copyright 2006: MultiService Forum

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Infrastructure ENUM I-ENUM

SIP Proxy

SIP Proxy

SIP Client A

Carrier B

Carrier A

SIP Client B

Internet

Infrastructure ENUM identifies interconnect point Copyright 2006: MultiService Forum

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VoIP Peering • IETF SPEERMINT WG is addressing VoIP peering problem in cooperation with Infrastructure ENUM • Infrastructure ENUM identifies the carrier of record, but… • if you have a business relationship, you already know the interconnection point for that carrier. • if you don’t have a business relationship, you probably won’t be allowed to directly interconnect anyway.

What problem is SPEERMINT solving? Copyright 2006: MultiService Forum

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ENUM for 3GPP IMS • IMS specifies that all routing shall be based on SIP URI • E.164 numbers shall be translated to SIP URI using ENUM, “or any other suitable translation database”

• ENUM in IMS must be Private ENUM • full SIP URI required for routing • data privacy laws • competitive information • Infrastructure ENUM can be used to interconnect between IMS networks


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IMS Call Routing Call Flow Private ENUM 2 1 1. 2. 3. 4.

HSS 3

S-CSCF

4

BGCF

call initiated with Tel URI query private ENUM for SIP URI query HSS for S-CSCF, and route to it if not in this IMS domain, then route to BGCF


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IMS Call Routing Call Flow Private ENUM 2 1

I-ENUM

HSS

IBCF

3

S-CSCF

5 4

6

BGCF

LNP 8

7 1. 2. 3. 4. 5. 6. 7. 8.

call initiated with Tel URI query private ENUM for SIP URI query HSS for S-CSCF, and route to it if not in this IMS domain, then route to BGCF query I-ENUM for interconnect point if for another IMS domain, route to IBCF if for PSTN, route to MGCF (pkt-to-pkt, or pkt-to-TDM) if necessary do LNP dip (info might be in I-ENUM)


MGCF

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Centralized Translations: Another Approach Centralized Translations IN • called # • calling # • context



• translated # • LNP (LRN) • Route list

Trunk Trunk Groups Groups

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Centralized Translations: Another Approach Translations Routing

Routing

Routing

Routing

Routing

Translations Routing


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Enterprise ENUM Internal Internal translation translation from from E.164 E.164 to to SIP SIP URI URI

SIP Client B

1

ENUM

2

3

SIP Proxy

SIP PBX

SIP Client A

Carrier B

Carrier A

SIP Client C

Internet

Enterprise ENUM can take many forms Copyright 2006: MultiService Forum

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Enterprise ENUM Public (e164.arpa)

User ENUM

3

Infrastructure ENUM

2 Private


Private ENUM

1

Infrastructure ENUM?

User URI

Interconnect URI

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New ENUM Applications - vCard vCard

ENUM SIP Proxy

SIP PBX

SIP Client A

Carrier A

Carrier B

SIP Client B

Query based on originating E.164 number Copyright 2006: MultiService Forum

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New ENUM Applications - CNAM SIP Proxy

P-ENUM

SIP PBX

SIP Client A

Carrier A

Carrier B

SIP Client B

Query based on originating E.164 number Copyright 2006: MultiService Forum

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Summary • When ENUM is specified, which version is it? • ENUM flavors are reasonably orthogonal • With clear rules they could be completely orthogonal

• Many interesting applications for ENUM will use Private ENUM


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Thank You