Grandstream Networks GXW42 SERIES User Manual page 46

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Preferred
Vocoder
Voice Frames per
TX:
G723 Rate
G726-32 packing
option
iLBC Frame Size
iLBC Payload
type
AAL2-G726-16
Payload type
AAL2-G726-24
Payload type
AAL2-G726-32
Payload type
AAL2-G726-40
Payload type
VAD
Fax Mode
Fax Tone
Detection Mode
Jitter Buffer Type
Jitter Buffer
Length
FIRMWARE 1.0.0.49
http://arttel.ru/shop/voip-shlyuzy/golosovoj-shlyuz-grandstream-gxw4216
The GXW42XX supports up to 5 different Vocoder types including G.711 A-/U-law, G.726
(Supports bit rates 16, 24, 32 and 40), G.723.1, G.729A/B, iLBC. The user can configure
Vocoders in a preference list that will be included with the same preference order in SDP
message. The first Vocoder is entered by choosing the appropriate option in "Choice 1". The
last Vocoder is entered by choosing the appropriate option in "Choice 8".
Number of the frame size when it transmits. Default is 2, from 1 -4 for G711/G726/G729
Defines the encoding rate for G.723 vocoder. By default, 6.3kbps rate is chosen.
Choose the packing mode for G726-32
Sets the iLBC frame size in 20ms or 30ms
Default value is 97. Defines payload type for iLBC. The valid range is between 96 and 127.
Default value is 100. Range is from 96 to 127.
Default value is 99. Range is from 96 to 127.
Default value is 104. Range is from 96 to 127.
Default value is 103. Range is from 96 to 127.
Default is No. VAD allows detecting the absence of audio and conserve bandwidth by
preventing the transmission of "silent packets" over the network.
T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec PCMU/PCMA)
Default is Callee. This decides whether Caller or Callee sends out the re-INVITE for T.38 or
Fax Pass Through.
Select either Fixed or Adaptive based on network conditions.
Select Low, Medium or High based on network conditions.
High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet the high
x
requirement
Medium (initial 100ms, min 20ms, max 200ms)
x
Low (initial 50ms, min 10ms, max 100ms)
x
GXW42XX USER MANUAL PAGE 46 OF 54