https://www.wombatdialer.com/

WombatDialer is highly scalable, multi-server, easy-to-use and
works with your existing Asterisk PBX.

  Telemarketing

Send a pre-recorded message to a list of contacts, and offer them an option to be put in contact with an operator if interested.

• When required, a maximum call duration can be enforced.
• Appointment reminders and cancellations.
• Track subscription expirations and process renewals.
• Product offerings.
• Debt tracking and collection.