Bay Networks Nautica 200 Reference Manual page 363

117237-C Rev. A
The unit receiving the call supplies a BACP callback
number to the unit making the call. This calling unit
dials the callback number to obtain the extra bandwidth.
For more information about BACP callback numbers,
refer to page 4-24 or Chapter 1.
Note: If BACP is enabled, MPP must also be enabled, and the
path on which BACP is set must have cnum values.
Defining PPP Profiles
12-13