- MultiConnect Adapter User Guide

Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 115
V.92 Commands (+P and –Q Commands)
This section describes the +P (PCM DCE) and –Q commands and parameters used to control the V.92 Mode
operation.
Command:
+PCW Call Waiting Enable
Description: Controls the operation of the modem in the presence of call waiting.
Defined Values: +PCW0 Request modem-on-hold if enabled by +PMH and collect caller ID
information if enabled by +VRID. Toggle V.24 circuit 125. (Default.)
+PCW1 Hang-up.
+PCW2 Ignore call waiting.
Result Codes: OK
ERROR
Report Commands: +PCW? Reports Selected Value(s).
+PCW=? Reports Supported Range of Parameter Values
Command:
+PMH Modem-on-Hold Enable
Description: Controls the selection of modem-on-hold in the modem. The action of the modem
in response to modem-on-hold events is determined by the state of this command
as well as the state of a negotiated handshake with a V.92-compliant server in V.92
Mode.
Defined Values: +PMH0 Modem-on-hold enabled in V.92 Mode. (Default.)
+PMH1 Disabled modem-on-hold.
Result Codes: OK 0 or 1 in V.92 Mode (see the +MS command)
ERROR
Report Commands: +PMH? Reports Current or Selected Value.
+PMH=? Reports Supported Range of Parameter Values.
Command:
+PMHR Initiate Modem-on-Hold
Description: Requests the modem to initiate or to confirm a modem-on-hold procedure. The
modem will return ERROR if modem-on-hold is not enabled or if the modem is in
an idle condition. The modem will return the string response +PMHR: <value>
where <value> is a decimal value corresponding to the status of the modem's hold
exchange procedure as defined below. This response may be delayed depending
upon the context under which the +PMHR command is made, i.e., if the +PMHR is
in response to an incoming modem-on-hold or if it is initiating a request.
Note: If modem-on-hold is enabled but the remote server does not support V.92
then the modem will always report 0 to show that the hold request is denied.
Response: +PMHR:<value>
The value corresponds to the maximum hold time the server or hold-granting
modem will allow.
+PMHR0 V.92 MOH request denied or not available.
+PMHR1 MOH with 10-second timeout Granted.
+PMHR2 MOH with 20-second timeout Granted.
+PMHR3 MOH with 30-second timeout Granted.
+PMHR4 MOH with 40-second timeout Granted.
+PMHR5 MOH with 1-minute timeout Granted.
+PMHR6 MOH with 2-minute timeout Granted.
+PMHR7 MOH with 3-minute timeout Granted.
+PMHR8 MOH with 4-minute timeout Granted
+PMHR9 MOH with 6-minute timeout Granted.
+PMHR10 MOH with 8-minute timeout Granted.
+PMHR11 MOH with 12-minute timeout Granted.
+PMHR12 MOH with 16-minute timeout Granted.
+PMHR13 MOH with indefinite timeout Granted.
Result Codes: OK 0-13 in V.92 Mode (+MS=V92)
ERROR