ZyXEL Communications P-2602HWLNI, User Manual, Page: 208 / 496

Chapter 11 Voice
P-2602HWLNI User’s Guide
208
11.23 Fixed Line Numbers
Configure the Fixed Line Numbers screen to:
• Use your analog phone(s) to make and receive calls over the ISDN line, using Multiple
Subscriber Numbers (MSNs). See Section 11.23.1 on page 208 . The MSNs you enter here
are used in the VoIP > Phone > Analog Phone screen, which you must also configure.
• Use your ISDN phone to receive incoming calls over the analog (PSTN) line. See Section
11.23.2 on page 209 .
11.23.1 Multiple Subscriber Numbers
MSNs allow you to use two or more phone numbers on one ISDN line. This is similar to
conventional extension numbers (for example 0123456 ext. 789). However, MSNs are
supplied by your ISDN service provider, and are configured directly in your ISDN devices.
They do not require you to use any other equipment.
For example, Alice and Bob subscribe to an ISDN service that gives them an ISDN line (with
the phone number 123456) and two MSNs (777 and 888). They connect their ISDN phones
directly to the ISDN line. Alice configures her ISDN phone to use one MSN (777) and Bob
configures his phone to use the other (888). When someone calls 123456777, only Alice’s
phone rings, and when someone calls 123456888, only Bob’s phone rings.
"
When you use MSNs with ISDN devices connected to the ZyXEL Device’s
ISDN PHONE port you do not need to configure MSNs in the ZyXEL Device.
For details on configuring MSNs on your ISDN device, refer to the
documentation provided by its manufacturer.
11.23.1.1 MSNs and the ZyXEL Device
The ZyXEL Device enables you to use analog devices connected to the PHONE 1 and
PHONE 2 ports to make and receive ISDN calls. You can also use MSNs, if you subscribe to
an MSN service.
For example, Carol and David subscribe to an ISDN service that gives them an ISDN line
(with the phone number 987654) and two MSNs (333 and 222). However, they do not have
ISDN phones. They take the following steps to use analog phones with their ISDN line.
• Carol connects her analog phone to the ZyXEL Device’s PHONE 1 port, and David
connects his to the PHONE 2 port. They connect the ISDN line to the PSTN/ISDN port.
Apply Click this to save your changes and to apply them to the ZyXEL Device.
Cancel Click this to set every field in this screen to its last-saved value.
Table 78 ISDN Line > General
LABEL DESCRIPTION