3Com Nbx 100 And Ss3 Nbx Administration Guide

							Managing the Dial Plan Configuration File51
Figure 6   Dial Plan Test Results
Generating a
Dial Plan ReportThis section describes how to create a report containing all dial plan 
settings, tables, routes, and pretranslators. The report also performs 
a consistency check to ensure that all dial plan table entries point to valid 
routes which, in turn, point to valid extensions. The report also identifies 
how many devices are using each dial plan table and each pretranslator.
Consider these common dial plan problems:
■Dial plan table entries that point to nonexistent routes
■Timed route entries that point to nonexistent destination routes
■Destination route entries that point to nonexistent extensions or 
empty extension lists
■Timed route entries that overlap
■Devices that do not specify a normal table 
						

							52CHAPTER 2: DIAL PLAN
■Devices that point to nonexistent Normal tables, Least Cost Routing 
tables, or pretranslators
■Pretranslator entries that have no operations
If a telephone has no table assigned, that telephone does not have 
permission to dial. This error is flagged in Reports. If a device has only a 
Normal table, no error is reported. 
If a device has only a Least Cost table, an error is reported. The telephone 
is still usable and has permissions defined in whatever table has been 
chosen as Least Cost.
If a device has both a Normal and Least Cost table, no error is reported 
(the usual condition).
When the NBX system detects an error in any line of an imported dial 
plan configuration file, it ignores that line and continues to process all 
remaining lines in the file. This precaution minimizes the impact of errors 
on the dial plan.
To generate a dial plan report:
1In the NBX NetSet – Main Menu window, click Dial Plan. The Dial Plan 
window appears, displaying the Operations tab (Figure 3
).
2Click 
Report. The dial plan report appears (Figure 7). Scroll up and down 
the browser window to see the full display.
3Click Close.
Figure 6
 indicates that an invalid number has been dialed. The person 
validating the dial plan test is responsible for verifying that the test call 
used the correct dial plan table and dial plan table entry.
To record test results and send them to  someone, select the text in the 
results pane and use the browser’s copy function (typically found in the 
Edit menu) to copy the test results to another application window, such 
as an editor or e-mail. 
						

							Managing the Dial Plan Configuration File53
Figure 7   Dial Plan Report — Partial Dialog Box
Errors can prevent calls from being successfully routed. Warnings are 
conditions that you can easily correct to successfully route the call.
4When you are finished, click Close at the bottom of the screen.
Modifying a Dial Plan
Configuration FileThis section describes how to modify the currently loaded dial plan 
configuration file.
CAUTION:Modifications must be syntactically correct. Each time that the 
system imports a dial plan configuration file, it verifies the file for errors 
and displays the results. To avoid typing mistakes, 3Com suggests that 
you start with an existing dial plan (for example, one of the default plans 
that are shipped with the NBX system or a plan from another NBX 
system), modify it, and save it as a renamed file.
To modify a dial plan configuration file:
1In the NBX NetSet – Main Menu window, click Dial Plan. The Dial Plan 
window appears, displaying the Operations tab (Figure 3
).
2Click 
Modify. The Modify Dial Plan dialog box shows a partial display 
(Figure 8
). Scroll up and down the browser window to see the complete 
dial plan. 
						

							54CHAPTER 2: DIAL PLAN
Figure 8   Modify Dial Plan Dialog Box — Partial Display
3Edit the dial plan configuration file. A single line of space is required 
between each dial plan entry. You can type a complete dial plan entry 
anywhere in the file.
4Click OK. The Import Confirmation dialog box prompts you to confirm 
the changes.
5Click Ye s . The system imports the modified dial plan. The Dial Plan 
Consistency dialog box appears, displaying the results of the error and 
consistency checks.
6Make a note of any errors, and correct them by editing the file.
You may be required to make changes based on warning messages.
7Click Close. 
						

							Outdialing Prefix Settings55
Outdialing Prefix 
SettingsA telephone user can look up a call in the call logs (Missed Calls, 
Answered Calls, and Dialed Calls) using the telephone display panel, 
select a telephone number from any of the logs, and redial it.
To redial a number from the Missed Calls or Answered Calls list, the NBX 
system needs to know the appropriate dial prefix to prepend to the digits 
in the telephone number.
For information and examples about how to configure outdialing 
prefixes, see the Help at NBX NetSet > Dial Plans > Operations > 
Outdialing Prefixes.
Managing 
ExtensionsThis section describes how to add, change, and manage extensions:
■Extension Settings Overview
■Changing Extension Length and Ranges
■How Auto Discovery Assigns Extensions
■Modifying Extensions
Extension Settings
OverviewThe NBX system establishes connections between extension numbers. 
The concept of an extension applies to more than just telephones. 
Extensions are also assigned to NBX applications such as Call Park zones, 
Auto Attendants, hunt groups, Line Card ports, voice mail ports, and 
virtual devices such as the pcXset™ PC soft telephone Client and the 
ConneXtions H.323 Gateway.
The extension length (either 3 or 4), which applies to all extensions on a 
system, indicates that all extensions contain that number of digits. You 
cannot mix 3-digit and 4-digit extensions within the same NBX system.
The NBX 100 and the SuperStack 3 NBX systems both support 3-digit and 
4-digit dial plans, although there are some differences in the extension 
ranges as noted in these tables. By default, the NBX 100 uses a 3-digit 
dial plan, and the SuperStack 3 NBX uses a 4-digit dial plan. 
						

							56CHAPTER 2: DIAL PLAN
Ta b l e 8 lists typical extension ranges in a 3-digit and a 4-digit dial plan. 
Ta b l e 9
 describes these ranges in more detail and gives the default ranges 
and values for 3-digit and 4-digit dial plans.
Ta b l e 8    Typical Extension Ranges for 3-digit and 4-digit Dial Plans
Extension Type3-digit (See Notes 1 and 2)4-digit (See Notes 1 and 2)
TelephonesNBX 100: 
100–449SuperStack 3 NBX: 
1000–3999
Auto Attendant500–599500, 501, plus 5500–5599
Hunt GroupNBX 100: 450–499 
(maximum of 30 groups)SuperStack 3 NBX: 
4000–4099
External Extensions 
(includes line card 
ports and Call Park)600–799 
(external Auto Discovery 
starts at 750)6000–7999 
(external Auto Discovery 
starts at 7250)
Call Park (must fall 
within External 
Extension range)NBX 100: 
601–609SuperStack 3 NBX: 
6000–6099 
Note 1: The NBX 100 is shipped with a factory default 3-digit dial plan. If you import 
any 4-digit plan, you must manually specify any 4-digit extension ranges that are not 
set by the imported plan. You must also manually change any device extensions so 
that they fall within the appropriate range.
Note 2: The Superstack 3 NBX is shipped with a 4-digit dial plan. If you import any 
3-digit plan, you must manually specify any 3-digit extension ranges that are not set 
by the imported plan. You must also manually change any device extensions so that 
they fall within the appropriate range. 
						

							Managing Extensions57
Ta b l e 9 provides a more detailed explanation of extension types, including 
default extension ranges and values for 3-digit and 4-digit dial plans.
Ta b l e 9    Dial Plan Extension Settings
FieldPurpose (See Notes 1 and 2)
Telephone 
Extensions RangeThe range of extensions for telephones.
■SuperStack 3 NBX: 1000–3999
■NBX 100: 100–449
Length — This pull-down field specifies the number of digits for 
telephone extensions. 
Auto Attendant 
Extensions RangeThe range of extensions for Auto Attendants. 
Default:
SuperStack 3 NBX: 5500–5599
NBX 100: 500
–599 
For both 3-digit and 4-digit dial plans:
■Extension 500 is reserved as the default Auto Attendant.
■Extension 501 is reserved as the voice mail Auto Attendant.
Default Auto 
Attendant 
ExtensionsDefault extension that the NBX system assigns to the default 
Auto Attendant. The Auto Discovery process assigns this 
extension.
The system must direct each call coming in on an external line to 
an extension. During the Auto Discovery of external lines 
(analog lines and Digital Line Card channels), the NBX system 
assigns the default extension (500) as the Auto Attendant 
extension. After you import the dial plan configuration file and 
complete the Auto Discovery process, you can manually 
configure the extension for each analog line and each Digital 
Line Card channel, if you want.
For both 3-digit and 4-digit dial plans:
■Extension 500 is reserved as the default Auto Attendant.
■Extension 501 is reserved as the voice mail Auto Attendant.
Hunt Group 
Extensions RangeThe range of extensions for hunt groups.
■SuperStack 3 NBX: 4000–4099
■NBX 100: 450–499 (maximum of 30 hunt groups)
External 
Extensions RangeThe range of extensions that are connected to external devices, 
such as Analog Line Card ports, Digital Line Card ports (BRI-S/T, 
T1, E1, ISDN PRI), Call Park, and Paging extensions.
Default:
■SuperStack 3 NBX: 6000–7999
■NBX 100: 600–799 
						

							58CHAPTER 2: DIAL PLAN
Some countries reserve numbers beginning with 11 for numbers of 
national importance. To accommodate this requirement, you can begin 
the telephone extension range at 120.
Call Park 
Extensions RangeThe range of extensions for Call Park. This feature allows the 
user to temporarily park a telephone call and then pick it up at a 
different telephone. Call Park extensions must be a subset of 
external extensions.
■SuperStack 3 NBX: 6000–6099
■NBX 100: 601–609
Start External 
Discovery AtThe extension to use when autodiscovering external devices. 
The system assigns extensions starting with this number and 
incrementing upward as they are discovered. If the highest 
extension is reached, the system starts looking from the 
beginning of the external range and selects the first unused one.
Typically, systems do not use all of the available external 
extensions from 600–799 in a 3-digit dial plan or from 
6000–7999 in a 4-digit dial plan.
Default:
■SuperStack 3 NBX: 7250
■NBX 100: 750
External Keyset 
PrefixIn Keyset mode, when a button on an NBX Business Telephone 
directly accesses an outside line, the NBX system must check 
Class of Service. The system prepends the External Keyset Prefix 
value (typically 8, 9, or 0) when it makes a call in Keyset mode.
Note 1: The NBX 100 is shipped with a factory default 3-digit dial plan. If you import 
any 4-digit plan, you must manually specify any 4-digit extension ranges that are not 
set by the imported plan. You must also manually change any device extensions so 
that they fall within the appropriate range.
Note 2: The Superstack 3 NBX is shipped with a 4-digit dial plan. If you import any 
3-digit plan, you must manually specify any 3-digit extension ranges that are not set 
by the imported plan. You must also manually change any device extensions so that 
they fall within the appropriate range.
Ta b l e 9    Dial Plan Extension Settings (continued)
FieldPurpose (See Notes 1 and 2) 
						

							Managing Extensions59
Changing Extension
Length and RangesYou can view and change extension settings, such as extension length 
and extension ranges.
If you are changing from a 3-digit to a 4-digit plan, import the 4-digit dial 
plan configuration file before you configure or autodiscover any devices.
To view and change extension settings:
1On the Operations tab (Figure 3
), click Settings. The Settings dialog box 
appears (Figure 9
).
Figure 9   Settings Dialog Box
2Make the desired changes to the extension settings. Table 9 describes 
each field.
3Click OK to enable your changes and exit the dialog box.
Planning Extension Ranges
By planning extension range on your system, you can accommodate your 
present and future needs.
Example: If you initially have 60 telephones and expect to add no more 
than 100 additional telephones in the future, choose 100–299 as the 
telephone extension range (1000–1199 in a 4-digit system). This 
arrangement provides 200 extension numbers to handle the planned 
160 telephones plus 40 extra extensions to handle unexpected additions.
Once you set the telephone extension range, you can extend it later, 
provided that the new range does not overlap any other number range. 
						

							60CHAPTER 2: DIAL PLAN
Example: For a 4-digit dial plan, you can set the initial telephone 
extension range to 1000–1099. This arrangement allows for up to 100 
telephone extensions. Later, you can extend the range up to 3999 to 
allow for 400 telephone extensions. By default, the Hunt Group range 
starts at 4000 on the SuperStack 3 and 450 on the NBX 100, so you 
cannot assign telephone extensions in either of those ranges.
How Auto Discovery
Assigns ExtensionsThe Auto Discovery process assigns new extensions to telephones and 
other devices. For example, if you install a T1 or E1 card, you can use 
Auto Discovery to assign extension numbers to each port on the card. 
The Auto Discovery process initially assigns a default name (new user) to 
each new telephone, and assigns the next available extension number. 
Later, you can replace (new user) with the appropriate user’s name.
It is possible to bypass the Auto Discovery process and to manually add a 
new telephone and assign an extension. However, 3Com strongly 
recommends that you take advantage of the Auto Discovery process. For 
instructions on using the Auto Discovery process or manually adding and 
configuring a new telephone, see the section on “Adding a New 
Telephone” in Chapter 3.
You can define a user in the system database without assigning a telephone 
to that user. By defining a user with no device, but with a telephone 
extension only, you create a phantom mailbox. The NBX system associates 
an extension with this phantom mailbox so that the user can have voice 
mail capability. To access voice mail from any telephone, the user calls 
either extension 500 (the default Auto Attendant extension), or 501 (the 
default Auto Attendant voice mail extension.)
Telephones and Line Card ports reserve most of the extensions within the 
system. However, there are other extensions within the system. Table 8
 
shows the default extension ranges for 3-digit and 4-digit dial plans.
Modifying ExtensionsYou can modify the extension number of any device in the system. 
Normally, you make changes only after you have changed the extension 
ranges for the NBX system, in order to align the extensions with the new 
ranges.
CAUTION:Be very careful when you change extensions. The system does 
not validate changes that you make here, and there is no Undo or Cancel 
function. A mistake can compromise the operation of the system.