It is possible to define multiple modem entries that refer to the same physical modem. Different initialization strings can then be associated with the different clones. Note that if using this method, you probably have to reboot the system after adding each modem before you can add another.
In order to use these cloned modems from VTS, you have to be able to specify which modem (or type of modem) to use for a particular call. This is achieved using the Area parameter to the modem tag, and the MakeCall method. Normally, the area parameter to a modem tag is unused. If it is used, then the Modem Manager will only select that modem for an outgoing call if the area matches the area parameter supplied to MakeCall.
Note that since a set of cloned modems actually map to one physical modem, only one of them can be in use at any time.
Further, only one of the clones may have incoming calls enabled. Failure to observe this will result in an error opening any of the modems in the clone set.