I don’t know of anybody that sells this as a service, but we accomplish a similar internal service with our asterisk PBX and IP phones.  It is programmed like an inbound call center.  When a customer calls a given number is plays a recording and asks a question. That voice message is recorded as a wav.  Then call is routed based the inbound number that was dialed.  When the call attendant (Call Center Employee) picks up the call the wav is played then asks the employee to press 1 to accept the call or two to decline or forward the call.  After pressing 1 the calls are connected.

It took a whole slew of programming but works well.

I don’t know if http://www.trixbox.org/ could be easily modified to support your requirements.  But it’s worth looking into.

Paul

From: plug-discuss-bounces@lists.plug.phoenix.az.us [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Bryan O'Neal
Sent: Tuesday, May 06, 2008 11:30 AM
To: Main PLUG discussion list; Arizona State University Linux Users Group
Cc: josh@revolutioncom.com
Subject: OT - Phone: Call redirection with whisper page

I am looking for a service where I can get a number (or a few hundred) for people to call into and then redirect that call to another number with a preemptive recording.  I would also need some basic statistics on the calls, such as how many people called each number and when.

Example - I put a number like 480-555-1212 on an ad for teeth whitening and a number like 480-55-2121 on an ad for braces and both calls get forwarded to the dentist at 480-555-8523 but when the receptionist picks up the phone she hears a recording telling her which number was called so she knows if they customer was looking for teeth whitening or braces before she ever talks to them.

Any suggestions?