ZyXEL Communications NVG2053, User Manual

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Chapter 17 Voice
NVG2053 User’s Guide
183
To access this screen, click VoIP > Call Rules > PSTN call through.
Figure 79 VoIP > Call Rules > PSTN call through
Each field is described in the following table.
17.9 Technical Reference
This section contains background material relevant to the VoIP screens.
VoIP
VoIP is the sending of voice signals over Internet Protocol. This allows you to
make phone calls and send faxes over the Internet at a fraction of the cost of
using the traditional circuit-switched telephone network. You can also use servers
to run telephone service applications like PBX services and voice mail. Internet
Telephony Service Provider (ITSP) companies provide VoIP service.
Table 63 VoIP > PSTN Line > General
LABEL DESCRIPTION
PSTN Line Pre-
fix Number Enter a prefix (up to seven numbers) you dial before you dial the phone
number, if you want to make a regular phone call while one of your SIP
accounts is registered. These numbers tell the NVG2053 that you want
to make a regular phone call.
Relay to PSTN
Line Enter phone numbers (for regular calls, not VoIP calls) that you want to
dial without the prefix number. For example, you should enter
emergency numbers.
The number (1 - 9) is not a speed-dial number. It is just a sequential
value that is not associated with any phone number.
Apply Click this to save your changes and to apply them to the NVG2053.
Cancel Click this to set every field in this screen to its last-saved value.