General Strategies for Using Modem ID Strings

The primary and best strategy for using modem ID strings in your INF file is to include every type of ID string you can obtain from the modem, using the tools described in Using Tools to Obtain Modem ID Strings from Modems. Then test the modem after it is installed with the INF file and if everything works as you want, you have a workable strategy. So, for example, if your modem is a Plug and Play ISA modem, you would include three different modem ID strings in your INF: the ISAPNP HardwareID, the ISAPNP Compatible ID string (if one can be obtained from this particular modem), and the Unimodem ID string.

The preceding strategy is the most robust strategy because:

• It helps eliminate duplicate enumeration.
• It increases the likelihood the modem will install properly.