This object is used for setting/reading the Dial Mode of a dialup path.
Only values (1) and (2) can be set to the object:
If the object is (1), the dialup path is configured for V25 mode dialing.
If the object is (2), the dialup path is configured for DTR mode dialing.
This object cannot be set to autoV25(3) or autoDTR(4), as these are setup automatically
by the autostartup dial mode detection logic.
The path has to be (re)enabled for any new setting to take effect.
Reading of the object can return any 1 of the 4 values.