I have an access server configured to accept call from outside through modems.Here is the configuration.When calls are made, the modems ring normally but terminates unexpectedly when verifying username and password.
the access-server should have a username entry for the remote device ppp host name.
the password is shared so can be
username remoteA password cisco
without this the access server router cannot authenticate the other side.
There are other problems however, because you debug ppp negotiation shows only Output packets (O) sent by local device.
received frames have an I.
other part is not talking PPP check encapsulation
Hope to help