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AT Command Reference
80-99208-1 Rev. D 6-45
Error Control Selection Command (+ES)
Syntax
+ES[=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]|?|=?]
Description
This extended-format compound parameter controls the
manner of operation of the V.42 protocol on the PSTN link
between the Gateway IWF and the host modem (if provided
in the IWF). It accepts three numeric sub-parameters:
As shown in the syntax above, any of
<orig_rqst>,
<orig_fbk> or <ans_fbk> may be optionally specified. If any
parameter is left unspecified, its value is left unchanged. If all
values are left unspecified then all are reset to their power-on
default values.
Optional parameters must be separated by commas. The
commas act as place holders (in the command parser) for the
missing optional parameter.
+ES? queries for the current parameter value settings.
+ES=? queries for the acceptable parameter ranges.
Valid Value(s)
<orig_rqst>:
<orig_rqst> Specifies the initial requested mode of
operation when the IWF is operating as the
originator.
<orig_fbk> Specifies the acceptable fallback mode of
operation when the IWF is operating as the
originator.
<ans_fbk> Specifies the acceptable fallback mode of
operation when the IWF is operating as the
answerer.
0 Direct mode.
1 Initiate call with Buffered mode only.
2 Initiate V.42 without Detection Phase. If V.8 is in
use, this is a request to disable V.42 Detection Phase.
3 Initiate V.42 with Detection Phase.
4 Initiate Alternative Protocol.