user manual
Grandstream Networks, Inc.  GXP21xx User Manual  Page 25 of 41 
                 Firmware version: 1.0.1.66         Last Updated: 05/2011 
802.1x Mode 
This option allows the user to enable/disable 802.1x mode on the phone. The default 
value is disabled. To enable 802.1x mode, this field should be set to EAP-MD5. 
Once enabled, the user would be required to enter the following information below to 
be authenticated on the network: 
•  Identity 
•
  MD5 Password  
Line Keys x 
This allows the user to configure the account mapped to each line key, as well as 
enabling SCA (Shared Call Appearance) for the line.  
Options available for Key Mode are : 
1.  Line 
2.  Shared Line 
Multi Purpose Key X 
These options are used to assign a function to the corresponding multi purpose key. 
Options available are:  
1.  Speed Dial. 
2.  BLF (Busy Lamp Field). This option has to be supported on the PBX and it 
indicates the status of the extension. The three possible states are idle 
(green), busy (red), ringing (blinking red). 
3.  Presence Watcher. This option has to be supported by a presence server 
and it is tied to the “Do not disturb” status of the phone. 
4.  Eventlist BLF. This option is similar to the BLF option but in this case the PBX 
collects the information from the phones and sends it out in one single notify 
message. PBX has to support this feature. 
Each function is connected to one of the accounts and has a target username and 
user ID.  
Time Zone 
This parameter controls the date/time display according to the specified time zone. 
If “Allow DHCP Option 2 to override Time Zone setting” is checked, the time zone will 
be overridden by the DHCP server. 
Self-Defined Time 
Zone 
This parameter allows the users to define their own time zone.  
The syntax is: std offset dst [offset], start [/time], end [/time]  
Default is set to: MTZ+6MDT+5,M3.2.0,M11.1.0  
MTZ+6MDT+5,  
This indicates a time zone with 6 hours offset with 1 hour ahead which is U.S central 
time. If it is positive (+) if the local time zone is west of the Prime Meridian (A.K.A: 
International or Greenwich Meridian) and negative (-) if it is east.  
M3.2.0,M11.1.0  
The 1st number indicates Month: 1,2,3.., 12 (for Jan, Feb, .., Dec)  
The 2nd number indicates the nth iteration of the weekday: (1st Sunday, 3
rd
Tuesday…)  
The 3rd number indicates weekday: 0,1,2,..,6( for Sun, Mon, Tues,..,Sat)  
Therefore, this example is the DST which starts from the second Sunday of March to 
the 1st Sunday of November.  










