ZyXEL Communications X6004 User Manual

Chapter 7 SIP Server

X6004 User’s Guide

You can also use the letters N, Z and X to represent numbers you want to block. The letter “N” 
represents any digit from 0-9, Z any digit from 1-9 and X any digit from 2-9. For example, 
enter 023NNNNNN to block any 9 digit number that starts with 023 from calling the 
extensions configured on the X6004. 
Furthermore, you can use the period (.) as a wildcard, to block any numbers that begin with a 
pattern of digits you specify. For example, enter 555. to block any numbers starting with the 
string 555 from calling the extensions configured on the X6004.
To access this screen, click Configuration > PBX > Server Configuration > SIP Server > 
Call Block(AA) > Black List.

Figure 87   Configuration > PBX > Server Configuration > SIP Server > Call Block > Black List 

Each field is described in the following table.

Use this screen to set values for the feature codes the X6004 supports. Users can dial these 
codes to enable or disable the features listed below by entering these codes on their phone’s 
keypad. Click Configuration > PBX > Server Configuration > SIP Server > Feature Code 
to open the screen as shown. 

Table 22   Configuration > PBX > Server Configuration > SIP Server > Call Block > Black List

Number

Type the telephone number you want the X6004 to block from calling extensions 

in your telephone network. Click Add to place this number in the blacklist. You can 

also use the letters N, X and Z to represent numbers and the period “.” to include 

any number that starts with the digits you specify.  

Delete

Highlight an existing telephone number in the blacklist and click the Delete icon to 

remove this telephone number from the blacklist.

Apply

Click this to save your changes.

Cancel

Click this to go back to the Call Block screen.