Cisco IP Telephony: Planning, Design, Implementation, Operation, and Optimization [Electronic resources] نسخه متنی

Telephony Numbering Plan

The dial plan or telephony numbering plan describes how voice calls are routed within the network and explains the site numbering plan and site-to-site dialing instructions. To replace or integrate the legacy PBX systems with the IP telephony systems, you should ask the customer the questions listed in Notes/Comments" section.

Yes

No

3

Has the organization developed a new dial plan for the IPT deployment?

Yes

No

4

Has the organization determined gateway-specific requirements, including protocol-supported and supplementary services (such as call hold, park, and conferencing)?

Yes

No

5

Has the organization determined gateway site-specific requirements such as encoding, calling line ID (CLID), DID support, analog or digital support, and fax relay?

Yes

No

6

Has the organization decided to implement TEHO? If yes, obtain the toll-bypass information in Table C-7.

Yes

No

Table C-5. Existing Numbering Plan
Site Name

On-Net Site Access Code

No. of Digits in Station Numbering Plan

DID Ranges

Station DN Numbering Ranges

Station Intercom Numbering Range

Voice-Mail Numbering Range

Current Number of Users

Expected Growth of Users in Next 3 Years

Table C-6. Class of Restrictions Groups

COR Group

Phone Types

Type of Access Granted

COR 1

Assigned to lobby phones

Local calls, emergency calls, toll-free calls, service calls such as directory assistance, and calls to other sites

COR 2

Employee phones

All access given to lobby phones plus long-distance calling

COR 3

Executive phones

All access given to lobby and employee phones plus international dialing

Table C-7. Local Calling Area List for Implementing Toll Bypass

Site Name, PSTN Access Code

DID Extension Range

Local Calling

In-State Toll Calling

In-State Toll Calling

Area Codes/Exchange

Number of Digits Dialing

Area Codes/Exchange

Number of Digits Dialing

Notes/Comments

Use