Voice message reminder software, VOIP, Calls number in database and plays recorded message..

We have a appointment system written in ASP.NET with MSSQL database. We are wanting to add voice reminders to our system, so our prerecorded message is played to a client 1 day before their appointment.

Does anyone know any software which can do this? We prefer VOIP, specifically using SIP.

I have a programmer which is doing the main system, but he is unaware of any software packages in which could assist us in completing this step. We do have a dedicated server for the communications system we choose.

Any help would be great! Thank-you.
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grbladesConnect With a Mentor Commented:
There is a PBX called Asterisk which is primarily Linux based but there is a windows port available. It is a full PBX so it probably a bit of overkill but you can create a .call file in a particular directory and get it to automatically phone someone (via SIP if you wish) and then once connected play a recording automatically.
dkwiebeConnect With a Mentor Commented:
Asterisk will do this very nicely along with a little bit of custom programming.  I wrote an application similar to this once, it was designed to give reminders.  In this case they dropped the numbers in a database and it would call X times until it got an answer.
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