ZyXEL Communications V501-T1 - Manual (Page 32)

Chapter 1 Introduction
V500 Series User’s Guide
32
At the time of writing, this User’s Guide covers the following models.
1.2 Applications
Here are some examples of how you can use your V500.
1.2.1 Make Calls via Internet Telephony Service Provider
In a home or small office environment, you can use the V500 to make and receive VoIP
telephone calls through an Internet Telephony Service Provider (ITSP).
The following figure shows a basic example of how you make a VoIP call through an ITSP. In
this example, you make a call from your V500 (A in the figure), which sends the call through
your modem or router (B) to the Internet and the ITSP’s SIP server (C). The VoIP call server
forwards calls to PSTN (Public Switched Telephone Network) phones through a trunking
gateway (D) to phones on the PSTN network (E). The VoIP call server also forwards calls to
IP phones (F) through the Internet.
Figure 1 Internet Telephony Service Provider Application
Table 1 Models Covered
V500 IP phone.
V501 IP phone with Power over Ethernet (PoE) capability.