ZyXEL Communications EMG6726-B10A, Руководство пользователя

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Chapter 22 Voice
EMG6726/8726-B10A User’s Guide
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Figure 147 VoIP > Call Rule
Each field is described in the following table.
22.8 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.
Circuit-switched telephone networks require 64 kilobits per second (Kbps) in each direction to handle a
telephone call. VoIP can use advanced voice coding techniques with compression to reduce the
required bandwidth.
SIP
The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that handles the
setting up, altering and tearing down of voice and multimedia sessions over the Internet.
Table 99 VoIP > Call Rule
LABEL DESCRIPTION
Clear All Speed
Dials Click this to erase all the speed-dial entries on this screen.
Keys This field displays the speed-dial number you should dial to use this entry.
Number Enter the SIP number you want the EMG to call when you dial the speed-dial number.
Description Enter a name to identify the party you call when you dial the speed-dial number. You can use
up to 127 printable ASCII characters.
Apply Click this to save your changes and to apply them to the EMG.
Cancel Click this to set every field in this screen to its last-saved value.