Ringless Voicemail

Ringless Voicemail delivers a text or pre-recorded voice message directly into the end user's voicemail box without ringing their phone. The end user receives a standard voicemail notification and listens to the message at their convenience.

Ringless Voicemail is available only in the United States and Canada. Use it through the API as a standalone channel, as failover for SMS, or as an alternative to SMS through Smart Messaging. See Integration options for details.

Key benefits

Ringless Voicemail provides a personal, non-intrusive voice channel. Messages land directly in the end user's voicemail without a disruptive call, and the channel improves delivery reliability when used as failover for SMS.

• No interruptions – End users are not disturbed by a ringing phone. They listen to the message when they choose.
• Personal voice touch – A human voice adds warmth and trust that text alone cannot provide, which helps engagement.
• Better reachability – Used as failover for SMS, Ringless Voicemail backs up undelivered SMS messages so fewer critical messages are lost.
• Flexible use – Send messages on their own or in combination with SMS, depending on the use case.
• Simple integration – Available through the API, so it fits into communication workflows.

Use cases

Common use cases include:

• Appointment reminders – Healthcare, beauty and wellness, and service appointments.
• Payment and billing reminders – Upcoming due dates and overdue notices.
• Delivery and order updates – Shipment status and delivery windows.
• Customer re-engagement – Follow-ups, renewal reminders, and loyalty program updates.
• Important notices – Service changes, policy updates, and account notifications.
• Critical message backup – SMS with voicemail failover for messages that must get through.

Example: A healthcare clinic sends patients an SMS reminder the day before their appointment. If the SMS is not delivered, Ringless Voicemail automatically leaves a short voice message in the patient's voicemail box.

Hi, this is City Clinic reminding you of your appointment tomorrow at 10 AM. Please call us if you need to reschedule.

The patient's phone does not ring. They see the voicemail notification and listen to it during their lunch break. The reminder reaches them and the clinic avoids a no-show.

Integration options

There are three ways to use Ringless Voicemail:

1. Standalone API – Type in text or use a pre-recorded audio file and send the message as a voice call directly into the end user's voicemail. For API details, see Send ringless voicemail.
2. Failover for SMS – If SMS delivery fails, use the Ringless Voicemail API to deliver the message instead after you receive the delivery report.
3. Alternative to SMS – Ringless Voicemail can be set up as an alternative to SMS as part of the Smart Messaging solution. If you are interested in this option, contact your Infobip Account Manager.