User's Manual

Menus and Parameters
2-69
BreezeACCESS 4.0 System Manual
The default selection is Enable.
! Endpoint Type – Defines the EndpointType components in H.323
messages for interoperability with other equipment using H.323.
Available options are Terminal, Gateway.
The default is Terminal
! Fax Relay – Defines the use of T.38 protocol for relaying fax
messages. T.38 is a protocol dedicated to fax. In the T.38
architecture, fax signals are demodulated at the voice/fax gateway
and sent over the IP network as IP fax packets using either TCP or
UDP, depending on the service environment. TCP provides 100%
error-free transmission, but the downside is reduced real-time
performance. When congestion occurs, routers discard TCP packets
first. UDP has good real-time performance, since routers do not
discard datagrams as readily as TCP packets. However, the
downside of UDP is a reduced quality of service. It is possible for
datagrams to get lost, arrive out of order, or to be duplicated. A
redundancy mechanism can be employed to restore IFP fax data
packets. At the other end of the IP network, the remote gateway
decodes IP fax packets and regenerates fax signals.
Modulation methods that can be used with the T.38 format are V.21
Channel 2, V.27ter 2400, V.27ter 4800, V.29 7200, V.29 9600, V.17
7200, V.17 9600, V.17 12000, and V.17 14400.
The Fax Relay menu includes the following parameters:
" Fax Relay Option – Enables or disables the use of the T.38
protocol for relaying fax messages.
The default selection is Disable.
" Fax Relay Redundancy – Defines the redundancy (number
of additional times each fax frame is transmitted) to be used
when transmitting T.38 fax messages.
Valid values: 0 –5.
Default value: 3.
! Battery Polarity – Defines the battery polarity for supporting an
external device, e.g. for coins or tokens charging purpose. This
feature is fully supported by units with voice card from revision D
and up.
The available options are:
" Forward Battery – Regular polarity
" Reverse Battery – Reverse polarity
NOTE:
To enable the Fax Relay Option, the Fast Start parameter must also be
enabled.