Chapter 23 Voice
VMG8825-B Series User’s Guide
244
Figure 147
VoIP > Call History > Call Summary
Each field is described in the following table.
23.10 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.
Table 111 VoIP > Call History > Call Summary
LABEL
DESCRIPTION
Refresh
Click this button to renew the call history list.
Clear All
Click this button to remove all entries from the call history list.
Date
This is the date when the calls were made.
Total Calls
This displays the total number of calls from or to your SIP numbers that day.
Outgoing Calls
This displays how many calls originated from you that day.
Incoming Calls
This displays how many calls you received that day.
Missing Calls
This displays how many incoming calls were not answered that day.
Total Duration
(hh:mm:ss)
This displays how long all calls lasted that day.