
Grandstream Networks, Inc. GXW-400x User Manual Page 17 of 39
Firmware 1.0.0.39 Last Updated: 5/2007
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ENDING AND RECEIVING FAX
GXW–400x 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.
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