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Overridden Settings
Almost all AT commands and S Registers stored before entering V.25bis mode will have effect
except for the following commands.
AT Command V.25bis Operation
&D Will act as if &D2 is selected
S0 Will act as if S0=1
These override settings are not stored in your modem’s non-volatile memory; they are active
only while V.25bis command mode is active. If you issue the &V command to view the modem’ s
configuration the original settings will be displayed.
V.25bis Commands
Six V.25bis commands are supported by your modem:
Command Description
CRN n Dial phone number n
CRS x Dial stored phone number x
PRN x:n Save n as stored phone number x
DIC Disregard an incoming call
CIC Connect to an incoming call
RST Restore factory default parameters
Data Formats
Not all data formats are supported when V.25bis operation is selected. Use only the types of
parity shown in the following table:
Mode Parity
Async V.25bis Even parity
Sync BSC Odd parity
Sync HDLC Bit 7 always zero in the information field.
Commands issued with the wrong parity are ignored by your modem.