When all the incoming users are using
the same name, you should use the
following (hidden) interface commands
ppp ipcp ignore-map
dialer mult-map-same-name
You should also use the endpoint as
the bundle name. If you still have
problems after this, please send the
config, as I'm not sure how you are using
multiple dialer interfaces with a single
physical interface, unless you are using
dialer profiles, in which case each
user (regardless if they are inbound or
outbound) requires their own dialer
interface. Note too that they is not
really a compelling reason to use a separate
interface for inbound and outbound users.