QuadroCS Manual II: Administrator's Guide
Administrator's Menus
Quadro
CS
(SW Version 3.0.x)
26
RTP Settings
The
RTP Settings
page allows the administrator to configure the codec’s packet size and silence suppression for each voice codec, to select the
G726 codec standard, to define RTP/RTCP port range and to enable the RTCP support. All parameters listed on this page may be modified and
submitted.
The
Codec Properties
table lists all codecs with the
corresponding packetization interval and information about
silence suppression.
Edit
opens the
Edit RTP Settings
page where the codec
settings can be modified. To use
Edit
, only one codec may be
selected at a time, otherwise an error occurs: “One record
should be selected”.
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. It is activated after 2
seconds of silence and restarted immediately if any audio
appears.
The
G.726 Standard
radio buttons are used to select the type
of packaging the G.726 code words into octets. If you
experience problems with G.726 voice quality having one of
these packaging types selected, try the other 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 code words is
used, where packing code words into octets is starting from
the most significant rather than the least significant position
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 code words is used, where packing code words
is starting from the least significant position in the octet.
Fig. II-38: RTP Settings page
RTP/RTCP Port Range for Participants:
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.
As 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 occur if this condition is not met.
The port range may consist of digits only, otherwise the error “Incorrect Port Range: only Integer values
allowed” occurs. The difference between Max and Min RTP ports should be 50 ports or less (according to system capabilities) otherwise a
corresponding warning appears. RTP/RTCP Port range cannot include the defined SIP UDP port. Otherwise “Mapped port for SIP shouldn't be in
RTP port range” error appears.
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
checkbox enables Real Time Control Protocol support and allows the transmission of RTCP packets. RTCP protocol is used
for monitoring the RTP streams and changing RTP characteristics depending on the Network conditions.
