Chapter 11 Voice
•Internet phone calls (Voice over IP or VoIP). These calls are made and received using the Internet connection on your ZyXEL Device. You need to configure a SIP account (see Section 11.4 on page 178) before making Internet phone calls.
•Analog phone calls. These calls are made and received using a PSTN (Public Switched Telephone Network) line connected to the PSTN/ISDN port on the ZyXEL Device.
•ISDN (Integrated Services Digital Network) phone calls. These calls are made and received using an ISDN line connected to the PSTN/ISDN port on the ZyXEL Device.
"If you use an analog phone to make and receive calls over the ISDN line, not all ISDN features may be available. Contact your ISDN service provider for details.
11.8.1.1Analog Phones and Multiple Subscriber Numbers
Multiple Subscriber Numbers (MSNs) allow you to use more than one phone number on a single ISDN phone line (see Section 11.23.1 on page 208). If you have MSNs from your ISDN service provider, you can use the Analog Phone screen to have the phone(s) connected to the analog PHONE ports make and receive ISDN calls using one or more MSNs. You must first configure the MSNs you want to use in the VoIP > Fixed Line Numbers screen (see Section
11.23on page 208).
11.8.2Configuring the Analog Phone ScreenUse the Analog Phone screen to do the following.
•Configure which SIP accounts each PHONE port uses to make and receive VoIP calls.
•Configure whether phones connected to each PHONE port can make and receive analog and ISDN calls.
"Phones connected to the PHONE ports make outgoing calls using a SIP account by default. You must enter a prefix number in your phone’s keypad if you want to make analog or ISDN calls. Use the VoIP > PSTN Line screen to configure the prefix number for analog calls (see Section 11.21 on page 206) and use the VoIP > ISDN Line screen to configure the prefix number for ISDN calls (see Section 11.22 on page 207).
Click VoIP > Phone > Analog Phone. The following screen displays.
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