US Robotics 56K USB Modem User Manual page 59

during a modem on-hold procedure. In particular, bits 16—19 of the sequence define hold time.
The +PMHR command does not have any extended syntax command forms.
Result codes:
• OK if the modem on-hold request is granted.
• ERROR if modem on hold is not enabled.
Table 118. Request Index
Bits 16:19
0000 Reserved for the ITU
0001 10 s
0010 20 s
0011 30 s
0100 40 s
0101 1 minute
0110 2 minutes
0111 3 minutes
1000 4 minutes
1001 6 minutes
1010 8 minutes
1011 12 minutes
1100 16 minutes
1101 no limit
1110 Reserved for the ITU
1111 Reserved for the ITU
+PMHT=<value>—Modem On-Hold Timer
Use this command to configure the controller-based modem to grant or reject a modem on-hold request.
This command configures the modem so it can respond to a modem on-hold request. The command must
be executed prior to reception of a modem on-hold request. If a modem on-hold request is made prior to
execution of the +PMHT command, by default, the modem on-hold request is denied.
This command also sets the modem on-hold timer. The modem on-hold timer sets the amount of time the
modem remains on hold waiting for the requesting modem to return to the line. If the timer expires, the
controller-based modem hangs up the call.
Result codes:
• OK if <value> = 0—13.
ERROR if <value> ≠ 0—13.
•
Table 119. Valid +PMHT Commands
Command
+PMHT=0 Denies modem on-hold request (default).
+PMHT=1 Grants modem on-hold request with a 10 s time-out.
+PMHT=2 Grants modem on-hold request with a 20 s time-out.
+PMHT=3 Grants modem on-hold request with a 30 s time-out.
+PMHT=4 Grants modem on-hold request with a 40 s time-out.
+PMHT=5 Grants modem on-hold request with a 1 min. time-out.
+PMHT=6 Grants modem on-hold request with a 2 min. time-out.
T1
Meaning
56K USB Modem
User Guide
Command Reference - 53