Yealink MeetingSpace VC800, Administrator'S Manual

Page: 128 / 295

Administrator’s Guide for Yealink VC800 Video Conferencing System
114
4.
Select
Enabled
from the pull-down list of
H.460 Active
.
5.
Click
Confirm
to accept the change.
To configure H.460 firewall traversal via the remote control:
1.
Select
More
->
Setting
->
Advanced
(default password: 0000) ->
H.323
.
2.
Select
Manual Settings
from the pull-down list of
Gatekeeper Type
.
3.
Enter the IP address and port number of the H.460 server in
Gatekeeper Server
and
Gatekeeper Port
fields.
4.
Check the
H.460
checkbox.
5.
Select
Save
, and then press to accept the change.
DTMF
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for telecommunication
signaling over analog telephone lines in the voice-frequency band. DTMF is the signal sent from
the IP phone to the network, which is generated when pressing the keypad during a call. Each
key pressed on the IP phone generates one sinusoidal tone of two frequencies. One is
generated from a high frequency group and the other from a low frequency group.
The DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and
each column representing a high frequency. Pressing a digit key (such as '1') will generate a
sinusoidal tone for each of two frequencies (697 and 1209 hertz (Hz)).