Sometimes: Error sending DTMF MM call (ModemManager crash)
I experienced a few times that pressing the #-sign during a phone call, seemed not to send it to the other side.
I do not know how to reproduce this. It happened all times when I was called as part of a 2FA-procedure. I have to press the # to confirm. The 2FA system keeps me calling, and when I (or the Librem 5) is not fast enough, the system will immediately place a new call if a call is not answered. Also in the log you can see two calls happened after each other.
Here is a snippet from the log: DTMF_issue.log
Afterwards, the mobile connection icon and the mobile data icon in the status bar were not visible any more.
Using the upper kill switch brought the mobile connection back.
Edit: I tried the 2FA then again, by sending the #-sign, but again I saw the Error sending DTMF MM call
in the log. I had to reboot the phone to make sending DTMF working again.