Example 2: Company With Existing Pbx - ZyXEL Communications X6004 User Manual

3.5.2 Example 2: Company with Existing PBX

For a company which already has a PBX. The X6004 is deployed between the PBX
and the telephone service provider. You can connect the X6004 to the telephone
service provider using PSTN connection (see
to use the FXO interface cards, the number of simultaneous calls supported is
greater and the cost is lower. In this example, we use one PRI line between the
X6004 and the PBX to support up to 23 (using T1) or up to 30 (using E1) voice
channels. The capacity and cost for call number support is greater than using FXO
interface cards. (Using 4 FXO interface cards supports only 16 simultaneous calls.)
• See an example of configuring ISDN settings in
• If you want the callers from the PBX's extensions not to go through the Auto-
Attendant, follow the instruction until step 5, select one of the following settings
and continue the other settings according the instruction.
• If you don't want incoming calls to go through the Auto-Attendant, select
Direct and configure settings as following (leave the Calling Party Number
section empty except you want to define the trusted callers). Then click
Apply.
Figure 24 Example: Direct
X6004 User's Guide
Chapter 3 Tutorials
Section 3.2 on page 50). Comparing
Section 3.4 on page 65.
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