Chapter 3: Connection Methods, Attributes and Configurable Features 27
which is usually a PC when modem emulation is used). If the TCP connection drops, DTR will be
lowered to indicate a Carrier Drop to the attached serial device.
Dialout translation
When the Allow Outgoing Calls option is enabled, the attached serial device usually specifies the
IP address and IP port number of the remote application with the ATDT command. However, some
devices that attach to modems may be unable to specify the IP address. In these cases, the ESP hub
modem emulation provides an optional phone number translation mechanism for
dialout applications.
A dialout translation set consists of a translate string (usually containing all or part of a telephone
number), an IP address and an IP port. You may configure up to eight translation sets for each ESP
hub serial port.
When an ATDT command is received, the modem emulation code first checks each of the eight
dialout translation sets. If the translate string is non-null, it is compared against the ASCII data
received after the ATDT command (that is, the target string). If it matches, an outgoing connection
is made to the specified IP address and IP port, instead of the target string. Dialout is only done on
the first translation set that matches the target string.
Table 3.8 lists the valid values for a translation set’s parts.
The translation sets are configured when the modem emulation connection method and outgoing
calls are enabled.
Table 3.8: Dialout Translation Set
Translation Set Part Description
Translate_string
A string of from 1-16 printable ASCII characters. The string may contain the
following wildcard characters:
? - to match any single ASCII character
* - to match multiple ASCII characters, including null characters
Examples of translate strings are:
1800-5551234
180055512??
1800*4
A null string creates a disabled translation set, and no other information
(IP address/port) is required.
The default is a null string.
IP address
IP address of the remote application, in standard dot notation. The address cannot
be 0.0.x.x, 127.x.x.x, 248-255.x.x.x or the IP address of the ESP hub.
The default is 0.0.0.0.
IP port
IP port number in the range 0-65535. If the destination IP port is on an ESP MI
hub, 4000 and 4100 should not be used.
The default is 0.
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