US Robotics 56K USB Modem User Manual page 58

Result codes:
• OK if <value> = 0, 1
ERROR if <value> ≠ 0, 1
•
Table 116. Valid +PMH Parameter Values
Value
+PMH=0 Enables modem on hold.
+PMH=1 Disables modem on hold (default).
Table 117. +PMH Extended Syntax Commands
Value
+PMH= <value>
+PMH?
+PMH=?
+PMHD<dialing_string>—Modem On-Hold DTMF Dialing
Use this command to switch the line while modem on hold is active. Execution of the +PMHD <dial_string>
command causes the modem to use DTMF dialing to dial the characters in the <dial_string>. Valid
<dial_string> characters are 0—9, #, and *. This operation is not supported in all countries.
Result codes:
• OK if <dial_string> is valid and modem on hold has been requested and granted.
• ERROR if <dial_string> is invalid or the modem is not on hold when the command is executed.
+PMHF—Modem On-Hold Hook Flash
Use this command to generate a hook flash during modem on-hold operations. The command causes the
modem to go on-hook for a period of time set by homologation parameter 26. Then the modem returns to
the off-hook state for an equivalent amount of time.
Result codes:
• ERROR if the modem is not on hold when the command is executed.
+PMHR—Initiate Modem On Hold
Use this command to initiate a modem on-hold request. Once the local modem receives this request from
the user or controlling application, the controller-based modem requests that the remote modem go on
hold. The remote modem either denies the request, grants the request, or generates an error if modem on
hold is not enabled. If the request is granted, the remote modem initializes the modem on-hold timer and
transmits the request index. If the request is denied, the remote modem only transmits the request index.
The request index either identifies the maximum hold time until the request is granted, or it identifies a
problem code when the request is denied.
The request index is encoded in a MH sequence. MH
1. For additional information on modem on hold and MH sequences, reference ITU-T Recommendation V.92, Section 8.9 for modem
on hold and Section 8.9.2 for MH sequences.
Meaning
Enables or disables modem on hold.
Displays the current state of the +PMH command.
Displays the supported +PMH parameter values.
Meaning
1
sequences are used to exchange information
56K USB Modem
User Guide
Command Reference - 52