Grandstream GXW400x User Manual - Manual (Page 26)

FIRMWARE VERSION 1.0.14.1 GXW400X USER MANUAL Page 24 of 60
PSTN PASS THROUGH/LIFE LINE
The RJ-11 line jack on the GXW400X side connected to a legacy PSTN line, functions as a pass through
jack when the GXW400X loses power or becomes unregistered. In this case, analog phone connected to
FXS port 1 will be directly connected to RJ-11 jack marked as LINE. The pass through/life line mode
enables the user to use the analog phone for PSTN calls directly without using an access code.
SENDING AND RECEIVING FAX
GXW400X supports fax in two modes: 1) T.38 (Fax over IP) and 2) Fax Pass through. T.38 is the
preferred method because it is more reliable and works well in most network conditions. If the service
provider supports T.38, please use this method by selecting T.38 as fax mode (default). If the service
provider does not support T.38, pass-through mode may be used. If you have problems with sending or
receiving Fax, toggle the Fax Tone Detection Mode setting.
SUPPORT RADIUS PROTOCOL
GXW400X supports RADIUS for authentication, authorization and billing purposes. Primary and
secondary RADIUS server configurations are available to provide redundancy to this feature. In case
Primary Radius server becomes unusable, RADIUS requests will be automatically sent to the secondary
server. When at least one RADUIS server was configured, the device will allow users to make phone calls
only after authorization from RADIUS server has been received. CDR (Call Detail Record) is also sent to
the RADIUS server for billing purposes. RAIDUS server can send requests to terminate calls when run
out of pre-paid credit.
The GXW400X will be able to work in VoIP billing environment using redundant double server
configuration. User will be able to configure primary and secondary RADUIS server IP Addresses or
FQDNs. Once at least one RADUIS server was configured, the device will allow users to make phone
calls only after permission from RADIUS server has been received. In case Primary Radius server
becomes unusable, secondary will take role of primary and will manage credit recourses in the network.
Imbedded RADIUS client also supports request generated by Radius server to terminate calls when run out of
pre-paid credit.