3com MSR 20-20 참조 매뉴얼
2688
C
HAPTER
176: F
AX
OVER
IP C
ONFIGURATION
C
OMMANDS
■
Increasing the number of redundant packets will improve reliability of network
transmission and reduce packet loss ratio. A great amount of redundant
packets, however, can increase bandwidth consumption to a great extent and
thereby, in the case of low bandwidth, affect the fax quality seriously.
Therefore, the number of redundant packets should be selected properly
according to the network bandwidth.
transmission and reduce packet loss ratio. A great amount of redundant
packets, however, can increase bandwidth consumption to a great extent and
thereby, in the case of low bandwidth, affect the fax quality seriously.
Therefore, the number of redundant packets should be selected properly
according to the network bandwidth.
■
The passthrough mode is subject to such factors as loss of packet, jitter and
delay, so the clock on both communication sides must be kept synchronized. At
present, only G.711 A-law and G.711 m-law are supported, and the voice
activity detection (VAD) function should be disabled.
delay, so the clock on both communication sides must be kept synchronized. At
present, only G.711 A-law and G.711 m-law are supported, and the voice
activity detection (VAD) function should be disabled.
Example
# Set to 2 the number of high-speed redundant packets sent via the T.38 fax
protocol.
protocol.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] dial-program
[Sysname-voice-dial] entity 4 pots
[Sysname-voice-dial-entity4] fax protocol t38 hb-redundancy 2
fax train-mode
Syntax
fax train-mode { local | ppp }
undo fax train-mode
View
POTS/VoIP/VoFR entity view
Parameter
local: Adopts the local training mode.
ppp: Adopts the point-to-point protocol (ppp) training mode.
Description
Use the fax train-mode command to configure the fax training mode.
Use the undo fax train-mode command to restore the default.
By default, the PPP training mode is adopted.
n
VoFR entities only support the PPP training mode.
Example
# Configure the local training mode for the gateway.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] dial-program
[Sysname-voice-dial] entity 10 pots
[Sysname-voice-dial-entity10] fax train-mode local