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Chapter 2 – AT Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F) 17
Modem Connection Commands
Command: +PCW=n Call Waiting Enable
Values: n = 0, 1, or 2
Default: 2
Description: Controls the action to be taken upon detection of a call waiting tone in V.92 mode.
Values specified by this command are not modified when an AT&F command is issued.
+PCW=0 Toggles V.24 Circuit 125 and collects Caller ID if enabled by +VCID.
+PCW=1 Hangs up.
+PCW=2 Ignores V.92 call waiting.
+PCW=? Displays the allowed values.
+PCW? Displays the currrent values.
Command: +PIG=n PCM Upstream Ignore
Values: n = 0 or 1
Default: 1
Description: Controls the use of PCM upstream during V.92 operation. PCM upstream allows faster
upload speeds to a V.92 server.
+PIG=0 Disables PCM upstream.
+PIG=1 Enables PCM upstream.
+PIG=? Displays the allowed values.
+PIG? Displays the current values.
Command: +PQC=n Quick Connect Control
Values: n = 0, 1, 2, or 3
Default: 3
Description: Controls the V.92 shortened Phase 1 and Phase 2 startup procedures (Quick Connect).
When line conditions are stable, quick connect results in shortened connect times;
however, significant fluctuations in line conditions from call to call can result in longer
connect times, in which case it may be advisable to disable quick connect.
+PQC=0 Enables Short Phase 1 and Short Phase 2 (Quick Connect).
+PQC=1 Enables Short Phase 1.
+PQC=2 Enables Short Phase 2.
+PQC=3 Disables Short Phase 1 and Short Phase 2.
+PQC=? Displays the allowed values.
+PQC? Displays the current values.
Command: +PSS Use Short Sequence
Description: This command causes a calling modem to force either a V.92 short or full startup
sequence as defined by the +PQC command on the next and subsequent connections.
Syntax: +PSS=<value>
Values: <value> Decimal number corresponding to the selected sequence.
0 The modems decide whether or not to use the short startup procedures.
The short startup procedures can only be used if enabled by the +PQC
command. Default
1 Reserved.
2 Forces the use of the full startup procedures on the next and subsequent
connections independent of the setting of the +PQC command.
Result Codes: OK 0 - 2 in V.92 Mode (+MS=V.92)
ERROR Otherwise
Report Commands: +PSS? Reports selected values.
+PSS=? Reports supported range of parameter values.