It seems that this ebuild doesn't support callback. PPP doesn't recognize callback option in "/etc/ppp/options" configuration file, and there is no explanation fow to do it in other way in man pages or docs. Reproducible: Always Steps to Reproduce: 1. emerge net-dialup/ppp-2.4.2_beta3 2. try to use callback
I suggest to mask this ebuild.
i masked it, hopefully it will be fixed until the final release...
fixed in -r1, the compile option to enable it had changed