NEC SL1100, Programming Manual

Page: 558 / 666

Item
No.
Item Input Data Description Default
08 G.729 Silence Com-
pression (VAD) Mode 0 = Disable
1 = Enable Select whether to compress silence with
G.729. When there is silence, the RTP
packet is not sent.
When VAD is enabled the CPU will stop
sending silence packets but the IP phone
will continue to transmit silence packets. 0
09 G.729 Jitter Buffer -
Minimum 0 ~ 300 ms Set the minimum value of the Jitter Buffer
of G.729 is set. Jitter is the variation in the
time between packets arriving and the buf-
fer allows this variation to be absorbed. 20
10 G.729 Jitter Buffer -
Standard 0 ~ 300 ms Set the average G.729 Jitter Buffer. 40
11 G.729 Jitter Buffer -
Maximum 0 ~ 300 ms Set the maximum G.729 Jitter Buffer. 80
17 Jitter Buffer Mode Set
the mode of the Jitter
Buffer. 1 = static
3 = adaptive immediately 1 = Size set to the fixed amount for the co-
dec.
2 = The minimum/maximum range for the
codec is used.
3 = The minimum/maximum range for the
codec is used and adjust at any time, re-
gardless of silence. 3
18 Silence Compression
(VAD) Threshold 1 ~ 30
(self-adjustment and - 19
dB ~ + 10dB)
1 = - 19 dB (- 49 dBm)
:
20 = 0 dB (- 30 dBm)
:
29 = 9 dBm (- 21 dBm)
30 = 10dBm (- 20dBm) Set the voice level judged to be silence.
Change value based .30
This entry is ignored if silence compres-
sion is disabled in 84-01-03 with G.711, or
84-01-06 with G.729. 20
28 Priority Codec Setting 0 = G711 PT
2 = G729 PT
3 = G.722 PT The option selected here determines what
other codec options are applied by priority. 0
30 EchoAuto Gain Con-
trol 0 ~ 5 Define the Auto Gain Control. 0
31 DTMF Payload Num-
ber 96 ~ 127 96
32 G.722 Audio Frame 1 = 10 ms
2 = 20 ms
3 = 30 ms
4 = 40 ms Maximum number of G.722 Audio Frames.
G.722 assumes the audio signal made by
a specimen by 16kHz and the frame of
10ms is assumed to be a unit to 64kbps by
the encoding compressed method.
The Audio frame size setting is only from
IP phone to IP phone. When the IP phone
communicates to a TDM device it will al-
ways use a 20 ms frame size.
Softphone (SP310) only supports 20 ms.
3
34 G.722 Jitter Buffer -
Minimum 0 ~ 255 ms Set the minimum value of the Jitter Buffer
of G.722 is set. Jitter is the variation in the
time between packets arriving and the buf-
fer allows this variation to be absorbed. 30
35 G.722 Jitter Buffer -
Standard 0 ~ 255 ms Set the average G.722 Jitter Buffer. 60
36 G.722 Jitter Buffer -
Maximum 0 ~ 255 ms Set the maximum G.722 Jitter Buffer. 120
37 RTP Filter 0 = Disable
1 = Enable 1
SL1000/SL1100 ISSUE 3.01
2-536 Program 84 : Hardware Setup for VoIPDB
Program
84