Multiple "missed call" messages

Hi all,

For some tenants within our FusionPBX deployment, we have enabled "Missed Call" at the ring group level to mail a message to a central mailbox.

The strange thing is that for most of the tenants, not all of them, multiple missed call messages (2) are being sent.

If I check /tmp/mailer-app.log I can see that multiple of the same messages are being sent out. So the system is generating multiple messages and I do not have a clue.

What to do?

No one with the same issue?
So instead of 1 "missed call" message the customer gets multiple (2). At some point even 3.
For customers with a lot of missed calls, this is annoying.
Who has a clue?