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AMIS Analog Networking

585-300-512 Issue 7

May 1999

Planning and Design

2-12Network Design

Overlapping or Duplicate Ranges

For all AMIS analog networking and message delivery addresses, duplicate

address ranges or overlapping address ranges are

not

permitted. A

duplicate

range

(or full overlap) means that the address range you have defined is already

defined for another machine. An

overlapping range

means that the range you

have defined is a subset of an already existing range or is overlapping another

range.

For example, you would be assigning a

subset

if you tried to assign the extension

range 2000-3999 when the range 2000-5999 already exists. The new range

would not be allowed (you would receive an error message). You would be

assigning an

overlap

if you tried to assign the extension range 5000-6999 when

the range 2000-5999 already exists. To avoid this problem, assign two new

ranges instead (1000-1999 and 6000-6999). If you cannot avoid a duplicate or

overlapping range, return to the"Address Prefixes" section and select an address

prefix that will make the range of numbers unique.

Extension Ranges and Length

Every remote machine in an AMIS analog/message delivery network

must

assigned an extension range. If you want local subscribers to access a specific

remote machine or telephone number (for example, for long-distance AMIS

casual systems or Message Delivery destinations), you can assign an extension

“range” of a single number (such as

4000

The length of the extension depends on the application. For example, on AMIS

one-step systems, the system dials the remote system’s telephone number for

the subscriber, allowing subscribers to type fewer digits. The interaction between

extension length and the

dial string

(the number the local system dials to reach

the remote machine) is summarized in the next section. Generally:

■

For AMIS one-step (pre-administered) connections:

The extension length

is typically the same length as other extensions on the switch. That is,

local subscribers’ extension numbers are the same length as other

extensions on the local switch, and remote subscribers’ extension

numbers are the same length as other extensions on the remote switch.

■

For AMIS two-step (casual) and Message Delivery connections:

The

extension length indicates how many digits entered by subscribers for an

AMIS or Message Delivery address are actually dialed by the local

system. For example, if the extension length is

, the local voice mail

system dials the dial string followed by the last seven digits of the number

a subscriber enters as an address (an AMIS prefix, if assigned, is not

dialed).

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