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Implementing Dial Plans on Voice Gateways

ImplementingNumbering plans

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Numbering Plans

Template for:

end devices

applications

Accounts for current needs and future growth

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Numbering Plan Categories

Private numbering plans

Public numbering plans

International numbering plan

National numbering plans

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North American Numbering Plan

CallingParty

CalledParty

LocalCO

Long DistanceCarrier (Virginia)

Dialed number:1 703-555-0123 703-555-0123

Path to 1(A 1 indicates that

the destination isNOT local.)

Path to 703(An area code of703 summarizes an

area in VA.)Texas Virginia

LocalCO

Path to 555(A prefix of 555

summarizes asmaller area in VA.)

Path to 0123(Subscriber)

Long DistanceCarrier (Texas)

2

1

3

4

5

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Scalable Numbering Plans

Simplified provisioning

Simplified routing

Summarization

Scalability Management

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Overlapping Directory Numbers

IP WAN

PSTNPhone 1-12001

Phone 1-22002

Phone 2-12001

Phone 2-22002

Router1Cisco

UnifiedCME

Router2Cisco

UnifiedCME

Same range of directorynumbers in two different

sites

San Jose Austin

Cisco Unified CME = Cisco UnifiedCommunications Manager Express

*

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Private and Public Numbering PlanIntegration

Challenges associated with integration:

Varying number lengths

Specialized services

Voice mail Necessity of prefixes or area codes

International dialing consideration

End-user training

Ease of use

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Integrating Internal and PublicNumbering Plans

PSTN VoIP

Gateway

?

123

0123

50123

Calling party dials 703-555-0123

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Integration of Internal and PublicNumbering Plans

Integrating PSTN for Backup Call Routing

San Jose

AustinAccess Code 5

5101

2

512-555-1012

1012

512-555-1012

PSTN

IP WAN

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Number Normalization

10.10.10.1

10.10.10.4

703555. 202555.727555.

813555.

305555.

Site A

Site B

Site C

Site D

Site E Site F

10 Digits

10 Digits

10 Digits

10 Digits

4 Digits

4 Digits

4 Digits

Frame Relay

Enhancing and Extending an ExistingPlan to Accommodate VoIP

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911 Terms and Components

ANI: The calling party number

ALI: A database record of telephone number-to-geographic location association;typically located in the PSTN

PSAP: Normally a police- or sheriff-run call center

ERL: The area from which an emergency call is placed and to which a 911 Emergency

Response Team (ERT) may be dispatched; used in VoIP mobility environments

ELIN: A phone number that is used to route the emergency call to the local PSAP andwhich the PSAP can use to call back the emergency caller; used in VoIP mobilityenvironments

MSAG: Maintained by a government agency; lists which PSAP serves a particularaddress range

Selective router: A specialized telephone switch used for 911 that routes calls to theappropriate PSAP based on the calling number (ANI) instead of the called number

CAMA: An analog phone trunk that connects directly to a 911 selective router,bypassing the PSTN

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911 Call Processing in a NonmobileEnvironment

Permanent user location: 555-1234:

123 N. Main St, Bldg. A, Floor 3, Northwest Corner

125 N. Main St.

123 N. Main St. CO Switch

Local ExchangeCarrier (LEC)

Network

555-1234911

CAMA

PRI

RouteDatabas

e

911 SelectiveRouter

555-1234

555-1234

,911 555-1234?

PSAP#?001

123

N.MainSt.

BuildingA,

Floor

3

NorthwestCo

rner

5

55-1234?

911

1

6

4

5

3

2

8

ALIDatabas

e

PSAP

#002

PSAP#001

7

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Implementing a Numbering Plan

972-555-1xxx

972-555-2xxx

Dallas

281-555-5xxxPSD

713-555-4xxxRichmond

713-555-1xxx

713-555-2xxx

713-555-3xxx

Houston HQ

Numbering PlanLocation

PSTN

Houston

PSTN

WAN

PSTN

Dallas1532 Users

PSD 945 Users

HQ2236 Users

Richmond429 Users

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Summary

Numbering plans define telephone numbers for voice endpointsand applications, whereas dial plans define call routing and digitmanipulation.

Numbering plans types include private and public numbering

plans. Scalable telephony networks require telephone numbering plans

that are hierarchical.

Overlapping number ranges are addressed through the use ofsite access codes.

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Summary (Cont.)

Varying number lengths, specialized services, voice mail, necessityof prefixes or area codes, and international dialing considerationsare challenges associated with integrating a private numbering planwith the public numbering plan.

Digit manipulation and number normalization are methods toextend and enhance VoIP numbering plans.

Cisco Emergency Responder dynamically tracks the adds, moves,and changes of mobile VoIP users and replaces the ANI with theELIN to identify the current location of the originator.

Implementing numbering a plan requires the numbering plandesign process include enumerating the number of current users ateach location and evaluating future growth requirements.

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