MG6000 Series Media Gateway User
’
s Manual
- 32 -
IAD.
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Audio Codec
Set voice as ITU-T codec algorithm standards. IAD support G.711A, G.711U, G.723, G.729, and G.726
(16k, 24k, 32k, and 40k). User could choose one or more audio codec modes and set their NOB. One of the
algorithms must be assigned as default. The grey button means the mode of audio codec is not supported.
Attention
：
a). MG6002/MG6032 only support G.711A, G.711U, G.723, G.729.
b). MG6004/MG6008 can
’
t support G.723.1 and G.729 at the same time, user could select one of them.
c). G.726 payload type must be different from RFC2833 payload type.
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Voice
a)
Echo canceller
: Check to enable echo cancellation;
b)
SCE
: Enable silence compression, the IAD can check the silent voice packages and compress them to
reduce bandwidth of the network. If the SCE is not enabled, the silent voice packages will be produced
and transmitted. Comfort noise will be sent during the period of silence to make user listening
comfortable;
c)
Input gain:
set local voice volume. Value range is -31dB to 31 dB and to -1dB by default. Actually user
could only set the value range from -25 to 10, otherwise the device will send the dialing tone all the time,
and the keystrokes will have no reaction.
d)
Output gain
：
Set remote voice volume. Value range is -31dB to 31dB and to -1dB by default.
e)
Voice delay level
：
It is divided to five level, they are minimal, less, moderate, greater and maximal.
Delay reduces with the level lowing, at the time ability of preventing time jitter reduces either, this will
make worse voice quantity.
f)
RTP Start Port
: During the call, media stream communicate through RTP ports. User just needs to
configure the RTP start port, system will compute the range of the RTP ports according to the device
series and the RTP start port. RTP ports range of MG6000 Series is 12000 to 14000 and 13000 by
default.
g)
Voice Packets TOS:
Configure the IP TOS value. There are five IP TOS: Default value, Minimize delay,
Maximize throughput, Maximize reliability, and Minimize monetary cost.
Attention
：
The default value of input/output gain is -1db. If the voice is too low, you can turn up the input/output gain
。
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Tone
a)
DTMF gain:
set volume of keypad tone. Value rage is -31dB to 0dB (maximum) and to -4dB by default,
b)
DTMF transport mode:
transport mode of keypad tone during calls. It can be set as transmit by voice,
RFC2833, INFO message.
i.
If setting as transmit by voice, keypad tone will transport by voice signal.
ii.
If setting as RFC2833, keypad tone will transport by RFC2833 format.
iii.
If setting as INFO message, keypad tone will transport by INFO format.
c)
RFC2833 Payload type:
If setting DTMF mode as RFC2833, this indicates the type which codec
