Restrict login through callback, not dial-in by mgetty?

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Hi,

I'm tring to make use the callback feature of mgetty to secure our modem 
service on Solaris 2.6. However, I have no way to configure it to meet our 
requirment as below. Could anybody give me a hand?

Requirement
===========
Without using the dialback modem, 
1. a dummy account with password, can initiate the callback 
2. users can only login through callback, but not dial-in.

I can implement step 1 but not 2. Does anybody have alternative?

Thanks in advance.
Raymond