ZyXEL Communications V501-T1 - Manual (Page 33)

Chapter 1 Introduction
V500 Series User’s Guide
33
1.2.2 Make Calls via IP-PBX
If your company has an IP-PBX (Internet Protocol Private Branch Exchange), you can use the
V500 to make and receive VoIP telephone calls through it.
In this example, you make a call from your V500 (A in the figure), which sends it to the IP-
PBX. The IP-PBX forwards calls to PSTN phones (B) on the PSTN network. The IP-PBX also
forwards calls to IP phones (C) through an IP network (this could include the Internet).
Figure 2 IP-PBX Application
1.2.3 Make Peer-to-peer Calls
Use the V500 to make a call to the recipient’s IP address without using a SIP server. Peer-to-
peer calls are also called “Point to Point” or “IP-to-IP” calls. You must know the peer’s IP
address in order to do this.
The following figure shows a basic example of how you would make a peer-to-peer VoIP call.
You make a call on your V500 (A), which sends your call through your modem or router (B)
and the Internet to the peer VoIP device (C).
Figure 3 Peer-to-peer Calling