Grandstream Networks UCM6510 User Manual page 279

Enable Random Password
Enable Auto Email To User
Disable Extension Range
Extension Ranges
Firmware Version 1.0.10.39
digits, with a minimum length of 4 digits. Repetitive digits pattern (such
as 0000, 1111, 1234, 2345, and etc), or common digits pattern (such as
111222, 321321 and etc) are not allowed to be configured as
password.
2. Password for extension registration, web GUI admin login, LDAP and
LDAP sync requires alphanumeric characters containing at least two
categories of the following, with a minimum length of 4 characters.
Numeric digits
Lowercase alphabet characters
Uppercase alphabet characters
Special characters
If enabled, random password will be generated when the extension is
created. The default setting is "Yes". It is recommended to enable it for
security purpose.
If enabled, UCM6510 will send Email notification to user automatically after
editing extension settings or adding a new extension.
If set to "Yes", users
pre-configured/configured on the UCM6510. The default setting is "No".
The default extension range assignment is shown in "Extension Ranges"
below.
Note:
It is recommended to keep the system assignment to avoid inappropriate
usage and unnecessary issues.
The default extension range assignment is:

User Extensions: 1000-6299
User Extensions is referring to the extensions created under web
UI->PBX->Basic/Call Routes->Extensions page.

Pick Extensions: 4000-4999
This refers to the extensions that can be manually picked from end
device when being provisioned by the UCM6510. There are two
related options in zero config page->Auto Provision Settings, "Pick
Extension Segment" and "Enable Pick Extension". If "Enable Pick
Extension" under zero config settings is selected, the extension list
defined in "Pick Extension Segment" will be sent out to the device after
receiving the device's request. This "Pick Extension Segment" should
be a subset of the "Pick Extensions" range here. This feature is for the
UCM6510 IP PBX User Manual
could disable the extension range
Page 278 of 339