AT Command Reference
80-99208-1 Rev. D 6-45
Error Control Selection Command (+ES)
Syntax
+ES[=[<orig_rqst>[, <orig_fbk>[,<ans_fb k>]]]|?|=?]
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-parameter s:
As shown in the syntax above, any of <orig_rqst>,
<orig_fbk> or <ans_fbk> may be optio nally specified. If any
parameter is left unspecified, its va lue 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 se ttings.
+ES=? queries for the acceptab le parameter ranges.
Valid Va lue( 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.
0Direct mode.
1Initiate call with Buffered mode only.
2Initiate V.42 without Detection Phase. If V.8 is in
use, this is a request to disable V.42 Detection Phase.
3Initiate V.42 with Detection Phase.
4Initiate Alternative Protocol.