QuadroFXO Manual II: Administrator's Guide
Administrator's Menus
QuadroFXO (SW Version 3.0.x)
39
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 ranges, etc. 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 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 G.726 voice quality having one of these
packaging 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 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-58: RTP Settings page
RTP/RTCP Port Range for FXS Lines
and
RTP/RTCP Port Range for IP Lines:
•
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 ports has to be higher than the minimum ports, 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 the system’s capabilities) otherwise
the corresponding warning appears. RTP/RTCP Port ranges cannot include the defined SIP UDP ports (see
) otherwise an 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
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.
