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ttylinux does not directly support dial-up networking with PPP and has no support at all for ISDN. Previous versions of ttylinux did have PPP and ISDN support; their package structure is being re-organized and they may return in a later version of ttylinux.
ttylinux does have the PPP binaries: /usr/sbin/pppd and /usr/sbin/chat, but currently it is up to you to configure and use them.