Sierra Wireless RJ-11 - Manual (Page 17)

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a.
4. Select Serial Settings from the menu on the left.
The Serial Settings page allows you to specify the baud rate,
protocol, character size, parity, stop bits, and flow control
behavior for the RJ‐11 port (Phone).
Figure 2-10: RJ-11 IP Gateway: Serial Settings
For more information on the serial and other settings, refer to
page 17 .
Note: For most configurations, the defaults for the other settings are
best. Change these parameters only if you know the device you will
be connecting to the RJ-11 IP Gateway requires special settings.
5. Click on the Reset/Reboot menu option for the IP Address
configuration and any changes to the serial port settings to
take effect.