Modem Configuration
Modem configuration functions enable you to configure a modem before making a
connection. An application can set modem options and determine the features of
a modem without using commands specific to any modem device. Following are the
general features an application may set before making a call:
- Primary mode of operation (synchronous, asynchronous, and whether error
control is enabled).
- V.42 error control (defined by CCITT recommendation V.42), including specific
parameters. CCITT stands for the International Telegraph and Telephone
Consultative Committee.
- V.42bis (defined by CCITT recommendation V.42bis) and MNP5 data compression.
- Time-out options, including call setup, inactivity, and buffered data delivery.
Before setting a modem's configuration, an application should determine the
capabilities of the modem device by using the
GetCommProperties function. This function fills in a
COMMPROP structure. This structure contains both a general portion, which applies to
all communications devices, and a portion that is specific to each provider
subtype. For modem devices, the provider-specific portion of the
COMMPROP structure is a
MODEMDEVCAPS structure.
An application can get and set the current configuration of a modem by using
the
GetCommConfig and
SetCommConfig functions, both of which use a
COMMCONFIG structure. This structure contains both a general portion, which applies to
all communications devices, and a portion that is specific to each provider
subtype. For modem devices, the provider-specific portion of the
COMMCONFIG structure is a
MODEMSETTINGS structure.
After configuring a modem, an application can use the telephony application
programming interface (TAPI) to actually establish a connection.
The modem configuration functions do not provide for long-term management and
maintenance of a modem. Modem service providers should supply modem
configuration dialog boxes for this purpose.
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