Depaepe Telecom HD2000 User Manual page 30

Voice Frames per TX
G723 Rate
VAD
Symmetric RTP
Jitter Buffer Type
Jitter Buffer Length
This field contains the number of voice frames to be transmitted in
a single packet. When setting this value, the user should be aware
of the requested packet time (used in SDP message) as a result
of configuring this parameter. This parameter is associated with
the first vocoder in the above vocoder Preference List or the
actual used payload type negotiated between the 2 conversation
parties at run time. e.g., if the first vocoder is configured as G723
and the "Voice Frames per TX" is set to be 2, then the "ptime"
value in the SDP message of an INVITE request will be 60ms
because each G723 voice frame contains 30ms of audio.
Similarly, if this field is set to be 2 and if the first vocoder chosen is
G729 or G711 or G726, then the "ptime" value in the SDP
message of an INVITE request will be 20ms. If the configured
voice frames per TX exceeds the maximum allowed value, the
HD2000IP will use and save the maximum allowed value for the
corresponding first vocoder choice.
The maximum value for PCM is 10(x10ms) frames; for G726, it is
20 (x10ms) frames; for G723, it is 32 (x30ms) frames; for
G729/G728, 64 (x10ms) and 64 (x2.5ms) frames respectively.
This defines the encoding rate for G723 vocoder. By default,
6.3kbps rate is chosen.
Default is No. VAD allows detecting the absence of audio and
conserve bandwidth by preventing the transmission of "silent
packets" over the network.
Default is No. When set to Yes the device will change the
destination to send RTP packets to the source IP address and
port of the inbound RTP packet last received by the device.
Select either Fixed or Adaptive based on network conditions.
Select Low, Medium or High based on network conditions.
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