ZyXEL Communications P-2304R-P1 Series - Manual (Page 30)

Chapter 1 Introducing the ZyXEL Device
P-2304R-P1 Series User’s Guide
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Figure 2 VoIP Service Provider Application
1.5.2 Make Calls via IP-PBX
If your company has an IP-PBX (Internet Protocol Private Branch Exchange), you can use the
ZyXEL Device to make and receive VoIP telephone calls through it.
In this example, you use your analog phone (A in the figure) and the ZyXEL Device (B)
changes the call into VoIP and sends it to the IP-PBX. For PSTN phones (C), the IP-PBX
forwards calls through the PSTN network. For IP phones (D), the IP-PBX forwards calls
through an IP network (this could include the Internet).
Figure 3 IP-PBX Application