ZyXEL Communications IP PBX X6004 - Manual (Page 88)

Chapter 3 Tutorials
X6004 User’s Guide
88
3.5.1 Example 1: Small/Medium Business
For a small/medium company, the X6004 is the only device that forwards ISDN
calls between the company and the telephone service provider.
• For an example of configuring ISDN settings, see Section 3.4 on page 79 .
• If you want outsiders to dialing in directly to extensions without going through
the Auto-Attendant, follow the instruction until step 5 , select DDI/DID and
configure the settings as following.
Figure 23 ISDN Network Configuration
In the DDI/DID Mapping, define DDI/DID Mask (the digits of the Directory
Number on the right) for extension mappings. For example, you define 4 for
the DDI/DID Mask and add 1001 to 1001 for the mapping rule. So an incoming
call 8005551001 will be forwarded to the extension.