Cvoice 6.0 S04 L02

Implementing Numbering plans

Implementing Dial Plans on Voice Gateways

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-1

Numbering Plans  Template for: – end devices – applications  Accounts for current needs and future growth

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-2

Numbering Plan Categories  Private numbering plans  Public numbering plans – International numbering plan – National numbering plans

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-3

North American Numbering Plan Path to 703 (An area code of “703” summarizes an area in VA.)

Texas Long Distance Carrier (Texas)

3

Virginia Long Distance Carrier (Virginia) 4

2

Path to 555 (A prefix of “555” summarizes a smaller area in VA.)

Path to 1 (A “1” indicates that the destination is NOT local.)

Local CO

Local CO

Path to 0123 (Subscriber)

5

Dialed number: 1 703-555-0123

1

Calling Party

© 2008 Cisco Systems, Inc. All rights reserved.

703-555-0123

Called Party

CVOICE v6.0—4-4

Scalable Numbering Plans  Simplified provisioning  Simplified routing  Summarization  Scalability  Management

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-5

Overlapping Directory Numbers San Jose

Austin

IP WAN

Router1 Cisco Unified CME Phone 1-1 2001

Phone 1-2 2002

PSTN

Same range of directory numbers in two different sites

Router2 Cisco Unified CME Phone 2-1 2001

Phone 2-2 2002

* Cisco Unified CME = Cisco Unified

Communications Manager Express

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-6

Private and Public Numbering Plan Integration 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

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-7

Integrating Internal and Public Numbering Plans Calling party dials 703-555-0123

? 0123 PSTN

VoIP Gateway

50123

123 © 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-8

Integration of Internal and Public Numbering Plans PSTN

512-555-1012

51

2-5

Austin Access Code 5

San Jose

-10

12

1012

51 01 2

IP WAN

55

Integrating PSTN for Backup Call Routing © 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-9

Enhancing and Extending an Existing Plan to Accommodate VoIP Number Normalization 703555….

202555….

Site E

727555…. Site A

Site F

10.10.10.1

4 Digits 10 Digits

10 Digits

10.10.10.4

813555…. Site B

Frame Relay Site D

10 Digits

10 Digits

4 Digits

305555….

Site C

4 Digits © 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-10

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 and which the PSAP can use to call back the emergency caller; used in VoIP mobility environments  MSAG: Maintained by a government agency; lists which PSAP serves a particular address range  Selective router: A specialized telephone switch used for 911 that routes calls to the appropriate 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

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-11

911 Call Processing in a Nonmobile Environment 1

34 12

911 Selective Router 555-1234 911 7

5

CO Switch

555-1234?

,9 34 12

6

PRI

“PSAP# ?001”

3

CAMA 125 N. Main St.

Route Databas e Local Exchange

8

PSAP #002

Carrier (LEC) Network

Permanent user location: 555-1234: 123 N. Main St, Bldg. A, Floor 3, Northwest Corner © 2008 Cisco Systems, Inc. All rights reserved.

555-1234?

55

5-

2

11

123 N. Main St.

“1 Bu 23 N ild N or in . M th g a w A in es , t C Flo St. or or ne 3 r”

55

4

5-

911

PSAP #001

ALI Databas e

CVOICE v6.0—4-12

Implementing a Numbering Plan PSD 945 Users

Dallas

PSTN

1532 Users PSTN

Houston Location

Numbering Plan

Houston HQ

713-555-1xxx

HQ

2236 Users

WAN

713-555-2xxx 713-555-3xxx Richmond

713-555-4xxx

PSD

281-555-5xxx

Dallas

972-555-1xxx 972-555-2xxx

© 2008 Cisco Systems, Inc. All rights reserved.

Richmond 429 Users PSTN

CVOICE v6.0—4-13

Summary  Numbering plans define telephone numbers for voice endpoints and applications, whereas dial plans define call routing and digit manipulation.  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 of site access codes.

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-14

Summary (Cont.)  Varying number lengths, specialized services, voice mail, necessity of prefixes or area codes, and international dialing considerations are challenges associated with integrating a private numbering plan with the public numbering plan.  Digit manipulation and number normalization are methods to extend and enhance VoIP numbering plans.  Cisco Emergency Responder dynamically tracks the adds, moves, and changes of mobile VoIP users and replaces the ANI with the ELIN to identify the current location of the originator.  Implementing numbering a plan requires the numbering plan design process include enumerating the number of current users at each location and evaluating future growth requirements.

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-15

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—4-16