Pstn Pass Through /Life Line; Sending And Receiving Fax - Grandstream Networks GXW400x User Manual

PSTN P T /L L
ASS HROUGH IFE INE
The RJ-11 line jack on the GXW400x side functions as a pass through jack when the GXW400x is out of
power. The pass through/life line enables the user to use the analog phone for PSTN calls directly
without using an access code.
S R F
ENDING AND ECEIVING AX
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.
Grandstream Networks, Inc. GXW400x User Manual Page 14 of 35
Firmware 1.0.0.67 Last Updated: 10/2007