1.5 Prerequisites/Preconditions

The following are the preconditions that have to be met in order for the CBCP to be initialized and used:

  • A dial-up link has to be established between the caller and the answerer.

  • The caller and answerer have agreed to negotiate callback settings using the CBCP. This has to be done through the negotiation of Callback Option (0x0D) of the LCP Protocol Extension as defined in [RFC1570], with the specific operation value of 0x06.