GoHigh MG3000-R, User Manual

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eliminate the echo heard by phone A, we need eliminate echo in terminal B.
VOIP GATEWAY32 provide the 128ms tail wave echo elimination capability (G.168), which
can try to eliminate the combined transmission imbalance echo caused by transformation
between 2 lines and 4 lines through the enhanced nonlinear echo control function.
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In VOIP GATEWAY32, the PT values of G.726
、
iLBC
、
DTMF 2833 et. Coders need be
configured by user, and should avoid conflict with the previous defined static PT value. In
addition, the dynamic PT values also should avoid conflict with each other; otherwise the
channel can not work normally.
Voice Coder Coder Type PT Value
G.711U
0 0
G.726-32
2 2
G.711A
8 8
G.7231
4 4
G.729
40 18
G.729A
18 18
G.729B
42 18
G.729AB
44 18
G.726-16
22 dyn
G.726-24
24 dyn
G.726-40
26 dyn
iLBC-13
28 dyn
iLBC-15
30 dyn
DTMF2833
NA dyn
Table 28
VOICE CODER TYPE OF VOIP GATEWAY32
Table 29, Table 30 list the static PT values of RTP protocol (RFC 3551), and allow user to set.
The coder whose PT type is “dyn” does not have designated static PT value in RTP protocol,
thus the PT value can only be configured within dynamic range.
PT Value Voice Coder Media Type
Sampling rate
（
（ （
（
Hz
）
） ）
）
0 PCMU Audio 8000
1 reserved Audio
2 reserved Audio
3 GSM Audio 8000
4 G723 Audio 8000
5 DVI4 Audio 8000
6 DVI4 Audio 16000
7 LPC Audio 8000
8 PCMA Audio 8000
9 G722 Audio 8000
10 L16 Audio 44100
11 L16 Audio 44100
12 QCELP Audio 8000
13 CN Audio 8000
14 MPA Audio 90000
15 G728 Audio 8000
16 DVI4 Audio 11025
17 DVI4 Audio 22050