With Ringless voicemail, keep in mind that you are not charged for failed attempts. You are only charged when the Ringless Voicemail is successful.
User Busy
This error indicates that the recipient’s phone line is currently in use, and the system was unable to leave the voicemail. You can retry the delivery later when the line is free.
Possible Causes
The recipient is currently on another call.
The recipient’s voicemail system is in use.
Network congestion or temporary technical issues.
Possible Solutions
Wait a few minutes and retry the voicemail delivery.
Use the scheduling feature to attempt delivery at a later time.
Verify the recipient’s phone number to ensure it’s correct.
Schedule during non-peak call times (e.g., mid-morning or mid-afternoon)
Number Not Reachable
This error means that the system could not connect to the recipient’s phone number. This might occur due to an invalid phone number, the phone being out of service, or network issues.
Possible Causes
The phone number is invalid or disconnected.
The recipient’s phone is turned off or out of service range.
Carrier restrictions or issues with the telecom network.
Possible Solutions
Enable PhoneCheckr to check if the number is VALID.
Contact the recipient to confirm their number is active.
Retry at a later time when network conditions might have improved.
Too Many Attempts
This error occurs when multiple attempts to deliver the voicemail to the same number have failed. It may be due to repeated issues such as a busy line or an unreachable number. Consider verifying the recipient’s phone number before trying again.
Possible Causes
Multiple failed attempts to connect due to busy lines or unreachable numbers.
System restrictions in place to prevent overloading.
Persistent issues with the recipient’s carrier or device.
Possible Solutions
Enable PhoneCheckr to check if the number is VALID.
Confirm the validity of the recipient’s phone number.
If the issue persists, consider contacting your support team to investigate further.
No Answer
This error indicates that the system called the recipient’s number but did not receive an answer or connection, preventing the voicemail from being delivered.
Possible Causes
The recipient did not pick up, and the system could not reach their voicemail.
The phone was turned off or in airplane mode.
Temporary network issues or poor signal.
Possible Solutions
Retry the delivery at a different time of day.
Check with the recipient to ensure their phone is on and functioning.
Use the scheduling feature to target optimal delivery times when the recipient is more likely to be available.
Known Litigator
This result appears when the phone number is flagged as belonging to a known or suspected TCPA litigator.
Possible Causes
Carrier flags it as high-risk.
Number appears in compliance/litigator databases.
Possible Solutions
Remove the number from your list permanently.
Do not attempt to contact this number again.
Use compliance scrubbing to prevent future hits.
Voicemail Not Detected — ⭐ Most Common Reason
This means the system could not detect a valid voicemail environment, so the platform cannot deliver the ringless voicemail.
Possible Causes
Carrier blocks ringless voicemail insertion.
Voicemail greeting or system doesn’t match expected patterns.
Phone rings too long with no voicemail pickup.
Voicemail not set up or mailbox full.
Carrier spam filtering blocks detection.
Possible Solutions
Retry at a different time of day.
Spread out your sends instead of blasting all at once.
Use clean, validated phone lists.
Remove numbers that repeatedly fail with this error.
Reupload your audio to ensure clean detection.
Ringless Delivery Rate
The Ringless Delivery Rate measures how many of your messages actually reach recipients’ voicemail boxes without ringing their phones. For most campaigns, a 45%- 65% delivery rate is considered strong.
Why your business should care:
Even if a message doesn’t get deposited, a missed call can prompt callbacks.
Delivery rates help you optimize campaigns and understand your audience engagement.
Tips for Better Delivery:
✅ Verify your contacts using Contact Lookup
✅ Schedule messages for optimal times (morning or early evening)
✅ Keep your recordings professional, concise, and friendly
Example for Businesses:
Imagine sending a promotion:
Short message: “Sale today. Call us.” → Low impact
Optimized message: “Hello! This is Max from XYZ Retail. Today only, we have 20% off all products. Call us now to grab your deal!” → Higher engagement
Business Focus: High-quality ringless messages help generate leads, increase sales, and improve customer satisfaction without interrupting their day.