serialConnectDialString
1.3.6.1.2.1.16.19.14.1.4
A control string that specifies how to dial the phone
number in order to establish a modem connection. The
string should include the dialing prefix and suffix. For
example: '^s^MATD9,888-1234^M' will instruct the Probe
to send a carriage return, followed by the dialing prefix
'ATD', the phone number '9,888-1234', and a carriage
return as the dialing suffix.
This object may not be modified if the associated
serialConnectStatus object is equal to active(1).