We are using the BBIS advanced donation form for our phonathon callers, to process credit cards. The form requires email address and some of the donors do not wish to provide their email address to the callers. The call will add a dummy email address. This passed the email address to BBCRM, as an update to the constituent record. This process may also help to reduce the scope for PCI compliance.
We are also considering a similar process for membership processing.