Added - Support for ISDN Dial-Out.

When the Modem Usage is set to Modem Sharing, dial out 64K ISDN calls can now be made. The modem command "at:m112=32" configures the modem for HDLC mode. This was changed in MultiAccess software (version 1.12). Please see Resolution 3376 for instructions on updating your MultiAccess MA30120.