[asterisk-users] Password protect a queue from callers?

[Caza Henha]

Hi, We currently testing a trixbox/asterisk installation and have used Freepbx to set-up and configure the box and it is running tremendously well. We have an generic IVR configured to which can transfer callers to a child IVR. This child IVR has a number of options to send the caller off to various queues. However we would like to protect some of the options with a password/pin number so that only callers with a valid pin can gain access to the queues. We have looked at pin sets but this doesn't seem to be the correct route, we also searched on the Internet but the queries we have used bring up options to password protect queues from agents not callers. 

Initially we are happy with using just the one pin number for all customers for testing purposes then to proceed to using a sql backend to allow us to uniquely give each customer their own pin. Has anyone any suggestions on which direction we should proceed; we presume it could be the "customer_app" route which from our limited experience will hook into a custom asterisk script but being new to freepbx and asterisk we are not sure how to go about implementing this solution or if it has already been done? Any advice is appreciated...
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