What Delivery Rate Should You Expect?
RVM delivery rates depend heavily on the quality of your contact list.
A delivery rate of approximately 30% is typical for average contact lists.
Lower rates usually indicate issues with:
Contact data
Phone numbers used for sending
Message quality
Why Are My Voicemails Failing?
Here are the most common reasons:
1. Sending too many RVMs at the same time
Sending more than 50 RVMs per hour from a single local number may result in the number being flagged by carriers for high, non-human call volume.
2. Recording Quality
Carriers use automated systems to detect spam-like messages. Recordings that sound:
Robotic
Repetitive
Low quality
are more likely to be blocked.
3. Contact List Issues
If your contact list includes outdated or invalid numbers, your delivery rates will decrease significantly.
Failure Types
After a campaign, you may see different failure reasons:
No Answer
The number is invalid or no longer in service. We recommend removing these numbers from your list.Voicemail Not Detected
The number is valid, but one of the following may apply:Voicemail may not be set up
Inbox may be full
The carrier may be blocking the call
Recommended action: Retry at a later time.
How to Improve Your Delivery Rates
Use the Right Number
For large contact lists, avoid sending high volumes from a single local number. Instead, use:
Toll-free numbers (best for scale)
Multiple numbers (number pools) to spread traffic
Keep Recordings Fresh
Update your message weekly or monthly
Use a natural, human tone
Avoid using the same script for extended periods.
Maintain a Clean Contact List
Remove failed numbers after each campaign
Regularly update and verify your data
Should I Retry Failed Voicemails?
Be selective when retrying:
❌ Do not retry “No Answer” failures, as these are likely invalid numbers.
✅ Retry “Voicemail Not Detected” failures after approximately seven days.
Retrying all failures may negatively impact your overall delivery performance.
Avoid Spam Labeling
Carriers monitor calling behavior and may flag suspicious activity.
To minimize this risk, consider the following:
Spread volume across multiple numbers
Avoid sudden spikes in sending
Keep your messaging natural and updated
You can also register your numbers on the Free Caller Registry to help reduce spam labeling.
Key Takeaways
Use toll-free or multiple numbers to achieve better results when broadcasting to lists larger than 1,000 contacts a day
Limit the number of contacts you send broadcasts to each hour by using our throttling feature, “Advanced Scheduling.”
Keep your recordings natural and updated
Regularly clean your contact lists
Only retry valid numbers
If you need assistance improving your RVM performance, our support team is available to help.