MitraStar Movistar GPT-2541GNAC, Руководство пользователя

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Chapter 21 Voice 181
21.7 Incoming Calls
Use this screen to see detailed information for each incoming call from someone calling you.
Click Voice > Incoming . The following screen displays.
Figure 112 Incoming Calls
Each field is described in the following table.
Table 103 Incoming Calls
LABEL DESCRIPTION
Refresh Click this button to renew the received call list.
Clear All Click this button to remove all entries from the received call list.
No. This is a read-only index number.
time This is the date and time when the call was made.
phone port This is the phone port on which you received the call.
Missed means the call was unanswered.
phone number This is the SIP number that called you.
duration This displays how long the call lasted.
21.8 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.