We have a UCM6510 using the latest firmware (220.127.116.11). Voicemail is enabled. Voicemails are sent via email to the users. A local copy of the voicemail is not kept on the UCM6510.
Based on the email logs, the last email to be successfully sent was on Friday (8/3/18) around 1pm. It was on Tuesday that someone noticed an issue. There was no indication of any issues from the UCM6510 as the MTA service probably crashed or hung up (no email alerts). No changes were made prior to the issue. A reboot corrected the issue. Unfortunately, any voicemails that were left between Friday 1pm and Tuesday (when we rebooted the UCM6510) were gone. We understand why this is as the users only need to get voicemails by email. Most of our users do not even have a handset so email is the best option.
My question is, what can I monitor to check to make sure the MTA service (or whatever is it is called for the UCM6510) is working and sending messages? I have enabled syslog on the UCM6510 but what PBX Module should I be checking for (if even possible)? Or if anyone else has any suggestions please let me know.