About the busy-out features and functions, Busy-out functions, Busy-out timer at end of call – Multi-Tech Systems MT5634ZBA User Manual
Page 33: Digit format *dd, Number of did digits expected, Wait for digit time-out time command
Chapter 4 - AT Commands, S-Registers, Result Codes
33
MultiModemDID User Guide
Command: *DT
Wait for Digit Time-Out Time
Values:
n = 0, 1, 2 or 3
Default:
0
Description:
This command is used to configure the time between each
digit the modem will wait. If the modem has not received the
proper number of digits when the timer expires, it will report
the digits it has received so far and move on to the answering
sequence described in the *DN command.
Command:
*DN
Number of DID Digits Expected
Values:
0-7
Default:
0
Description:
This command is used to configure the modem for the
expected number of digits from the central office (the central
office will send the last few digits of the called number). When
the proper number of digits are received, the modem will pass
the digit information to the host computer. After passing the
digits the modem will answer the incoming call if S0 is greater
than 0. Otherwise the modem will wait for the host computer to
issue an ATA command.
Command:
*DW
Busy-Out Timer at End of Call
Values:
0-255
Default:
0
Description:
This command defines the amount of time to busy out the
modem upon disconnecting from a DID call. The delay is ended
when the timer runs out or a *DS command is received.
*DW0 This command
disables the delay. It ends the delay, but it also
places the DID line a busy-out state.
*DW255 This command will extend the delay indefinitely.
About the Busy-Out Features and Functions
A Direct Inward Dial (DID) line can be put in a “Busy Out” state by
reversing the battery polarity the modem supplies to the line. This will
cause a caller to receiver either a busy signal in a single line system or
roll over to the next line in a trunk system.
The line is busied out in the following cases.
- Modem is set to the factory default DID start format *DS0
- Modem receives an incoming ring on the POTS line
- Modem is given the dial command ATD
- Modem is set with the *DW command to busy-out delay after
finishing a call
Command:
*DD
Digit Format
Values:
0, 1, 2
Default:
0
Description:
This command is used to configure the modem for the format
the central office will send the incoming digits. At this time, only
DTMF is supported.
*DD0 DTMF
*DD1 Pulse
*DD2 MF (MultiFrequency)