Technical Reference - ZyXEL Communications VMG892-B10A User Manual

Chapter 21 Voice
Click VoIP > Call History > Call History Incoming Calls. The following screen displays.
Figure 150 VoIP > Call History > Call History Incoming Calls
Each field is described in the following table.
Table 118 VoIP > Call History > Call History Incoming
LABEL
Refresh
Clear All
#
time
phone port
phone number
duration

21.10 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.
SIP signaling is separate from the media for which it handles sessions. The media that is exchanged
during the session can use a different path from that of the signaling. SIP handles telephone calls
and can interface with traditional circuit-switched telephone networks.
SIP Identities
A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP identity is
called a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the SIP account in a
252
DESCRIPTION
Click this button to renew the received call list.
Click this button to remove all entries from the received call list.
This is a read-only index number.
This is the date and time when the call was made.
This is the phone port on which you received the call.
Missed means the call was unanswered.
This is the SIP number that called you.
This displays how long the call lasted.
VMG8924-B10A and VMG8924-B30A Series User's Guide