Sierra Wireless RJ-11 - Manual (Page 57)

Hardware
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Modem Signal Behavior
The RJ‐11 IP Gateway is not a modem (DCE), but is a terminal
(DTE) device. It is designed to be connected to another DTE
device via RJ‐11 cable.The RI (Ring Indicator) signal does not
have a corresponding outgoing signal so it is not supported.
Specifically, the DTR, DSR and DCD signals should be crossed
with the device as follows:
To emulate a modem properly, the Host RJ‐11 IP Gateway does
the following: :
ERROR 4 Error in AT command
string
CONNECT 1200 5 Connected – Serial Port
Speed is 1200 baud
NO DIALTONE 6 Not Used
BUSY 7 Not Used
NO ANSWER 8 Not Used
CONNECT 2400 10 Connected – Serial Port
Speed is 2400 baud
CONNECT 4800 11 Connected – Serial Port
Speed is 4800 baud
CONNECT 9600 12 Connected – Serial Port
Speed is 9600 baud
CONNECT 14400 13 Connected – Serial Port
Speed is 14400 baud
Device RJ-11 IP Gateway
DCD,DSR DTR
DTR DCD,DSR
Result Code
(ATV1)
Numeric (ATV0) Reason