Quadro4Li Manual II: Administrator's Guide
Administrator’s Menus
Quadro4Li; (SW Version 5.3.x)
75
The
Packetization Interval
is the time interval between two
RTP packets of the same stream. If the interval is increased, the
overhead is decreased but the voice quality may deteriorate as
a result. If the interval is decreased, the network load is
increased and the delay is reduced.
Silence Suppression
disables RTP packet transmission in
case of no voice activity. This feature helps to avoid extra traffic
if the RTP stream contains no voice activity. It is activated after
two seconds of silence and restarted immediately if any audio
appears.
The
G.726 Standard
radio buttons are used to select between
packaging the G.726 codewords into octets. If you experience
problems with the G.726 voice quality when one of these
packaging is selected, try a different one.
•
If
Use ITU_T specification
is selected, the ITU I.366.2
(“AAL2 type 2 service specific convergence sublayer for
narrow-band services”) type packaging of codewords is
used, where packing code words into octets is starting from
the most significant rather than the least significant digit in
the octet.
•
If
Use
IETF RFC
is selected, the IETF RFC (“RTP Profile
for Audio and Video Conferences with Minimal Control”)
type packaging of codewords is used, where packing code
words is starting from the least significant position in the
octet.
Fig. II-132: RTP Settings page
RTP/RTCP Port Range:
•
Min
- minimal port has to be higher than 1024 and lower than the maximal port range. Only even numbers are allowed.
•
Max
- maximal port has to be lower than 65536 and higher than the minimal port range. Only odd numbers are allowed.
Since the specified maximum port has to be higher than the minimum port, the error message “Min port number should be less than max port
number” will appear if this condition is not met.
The port range must consist of digits only, otherwise the error “Incorrect Port Range: only Integer
values allowed” will appear. The difference between Max and Min RTP ports should be 100 ports or less (according to the system’s capabilities)
otherwise the corresponding warning appears. RTP/RTCP Port ranges cannot include the defined SIP UDP ports (see
) otherwise an
error message will appear.
Telephone Event Draft Support
enables telephony events transmission according to the draft-ietf-avt-rfc2833bis-04. The checkbox needs to be
toggled if the SIP destination party phone or IVR has problems recognizing DTMFs generated by the Quadro.
Enable RTCP Support
enables Real Time Control Protocol support and allows for the RTCP packets transmission. RTCP protocol is used for
monitoring the RTP streams and changing RTP characteristics depending on Network conditions.
The
RTP Settings – Edit Entry
page offers a drop down list and
a checkbox.
Packetization Interval
contains possible values (in milliseconds)
to be configured for the selected codec.
The
Enable
Silence Suppression
checkbox selection enables
voice activity detection for the selected codec.
Fig. II-133: RTP Settings - Edit Entry
To Edit Codec Parameters
1.
Select the codec from the
Codecs Table
that is to be edited.
2.
Press the
Edit
button on the
RTP Settings
page. The
Edit Entry
page will appear in the browser window.
3.
Change values in
Packetization Interval
and/or enable/disable
Silence Suppression
.
4.
To save the codec settings press
Save
, or to keep the initial data click
Back
.
NAT Traversal Settings
The
NAT Traversal
Settings
page is divided into separate pages used to configure General NAT settings, SIP NAT parameters, RTP and STUN
parameters for NAT and a page where the NAT Exclusion table may be filled.
