2.1 Compiling ppp with CBCP Support

If you want to use call-back then you need to make sure that daemon pppd (package ppp) supports it. To check if pppd supports callback, type in the shell:

     /usr/sbin/pppd dryrun callback 123

If pppd is installed in other directory, then specify the correct path. If you see message:

     /usr/sbin/pppd: unrecognized option 'callback'

it means that pppd was compilled without CBCP support.

To enable CBCP support in OS Linux do the following:

1. Untar the ppp source code package (you can download it from ftp://ftp.samba.org/pub/ppp/)
2. In file pppd/Makefile.linux find string `#CBCP=y' and replace it with `CBCP=y'
3. Configure ./configure, compile make, and install make install everything

Refer to ppp package documentation for more details.