Specifications

VoiceFinder VoIP Gateway Configuration Guide (APOS 2.0) Release Version 3.1
AddPac Technology Co., LTD
- 180 / 416-
3.6.2. Configuring T.38 Fax Relay
Below is a configuration procedure of T.38 fax relay;
From above configuration, using redundancy need more bandwidth for sending copied fax
packets. Therefore, the redundancy option is necessary for packet lossy network but should
consider the network bandwidth consumption.
The fax rate option is a maximum value and the real fax transmission rate is negotiated
automatically by two fax machines. The ‘fax rate disable’ means disable T.38 fax relay.
Above option is globally applied to all voip peers and overrided by option at voip peer.
3.6.3. Configuring FAX Relay with Bypass
When to configure the fax relay by G.711 PCM clean channel besides T.38 fax relay, use the
following commands in global configuration mode. To operate fax relay in this mode, the voice
channels needs to be opened by g711alaw or g711ulaw, so you need to check whether it is
possible to connect from codec and codec-class of dial-peer configuration to this mode.
Step Commands Purpose of Usage
1
(config)#voice service voip Change to voice service configuration mode
2
(config-vservice-voip)#fax protocol
{t38 [redundancy value] }
Set globalty applied default FAX protocol
. t38 : Enable T.38 Fax relay protocol.
. redundancy : (Optional) Redundant T.38 Fax
packet
. value : Redundancy value. 0 ~ 5, Default is 0.
3
(config-vservice-voip)#fax rate
{2400/ 4800 / 7200 / 9600 /12000 /
14400 / disable }
Set maximum FAX rate
3
(config-vservice-voip)#exit Exit voice-service configuration mode and return
to global configuration mode
Step Commands Purpose of Usage
1
model name(config)#voice service
voip
Change to voice service configuration mode
2
model
name(config-vservice-voip)#fax
protocol bypass
Specify global default fax protocol
3
model
name(config-vservice-voip)#exit
Exit voice-service configuration mode and return
to global configuration mode