Make Calls Via Ip-Pbx - ZyXEL Communications V310 User Manual

Chapter 1 Introducing the V310
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

1.2.2 Make Calls via IP-PBX

If your company has an IP-PBX (Internet Protocol Private Branch Exchange), such as the ZyXEL
ISG50, you can use the V310 to make and receive VoIP telephone calls through it.
In this example, you make a call from your V310 (A in the figure), which sends it to the ISG50. The
ISG50 forwards calls to PSTN phones (B) on the PSTN network. The ISG50 also forwards calls to IP
phones (C) through an IP network (this could include the Internet).
IP-PBX Application
Figure 2
14
V310 User's Guide