User's Manual

Chapter 10 Voice
P-2612HW Series User’s Guide
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10.13 SIP Technical Reference
This section contains background material relevant to the VoIP > SIP screens.
10.13.1 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.
10.13.2 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
SIP Prefix
Phone Book
This section displays all SIP prefix numbers currently configured on the
ZyXEL Device.
# This is a read-only index number.
Prefix This field displays the SIP prefix number you dial (before you dial the
phone number) in order to use the SIP account specified in the SIP
Index field.
SIP Index This field displays the SIP account used to make outgoing calls when
you dial the number in the Prefix field.
SIP Domain This field displays the SIP domain of the corresponding SIP account.
Modify Use this field to edit or erase the SIP prefix entry.
Click the Edit icon to copy the information for this SIP prefix entry into
the SIP Prefix section, where you can change it.
Click the Remove icon to erase this SIP prefix entry.
Clear
Click this to erase all the SIP prefix entries.
Cancel
Click this to set every field in this screen to its last-saved value.
Table 63 Phone Book > SIP Prefix
LABEL DESCRIPTION