Utility functions:

1. Enable TAPI debugging.
        > set debug <module> <level>
    examples:
        > set debug tapi32.dll 50
2. Open comm port and test it.
        > open port <name>
        > open line <lineid> /[om][diau]
    examples:
        > open port
        <1
3. Dump TAPI line info
        > dump line * /v
        > dump phone
        > dump port
        > dump modem
4. call <deviceid> <phonenumber> /dai