dn \- DN-11 ACU interface
The permissible codes are:
4 second delay for second dial tone
The entire telephone number must be
It is recommended that an end-of-number
code be given even though not all
ACU's actually require it.
/dev/dn0 connected to 801 with dp0
/dev/dn1 not currently connected
/dev/dn2 not currently connected