3Com MSR 30, MSR 50 manual Fax train-mode local ppp, Undo fax train-mode

2688 CHAPTER 176: FAX OVER IP CONFIGURATION COMMANDS

■ 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.

■ 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.

Example # Set to 2 the number of high-speed redundant packets sent via the T.38 fax 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

n

Use the fax train-modecommand to configure the fax training mode. Use the undo fax train-modecommand to restore the default.

By default, the PPP training mode is adopted.

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