Is there any way to dial out voice call from R11e-LTE modem to specified number, like sending sms with /tools sms send ? I tried the /interface lte at-chat atdphonenumber; command alternatively, but with no success too. The usecase is the “old school” kind of “supervisor” notification. Any help or experience?
Your issue is how you’d get the audio channels in/out of the modem…
There are certainly no AT commands on the R11e-LTE that take a file to play…
LTE per-se doesn’t have voice services, only data services. What LTE smart phones do is they include a VoIP app (with certain degree of “HW offload” to chipset), which works according to 3GPP standards. And it’s kind of logical that LTE modem vendors don’t include such an app in modem’s firmware …
LOL… I guess “HW offload” is good way to describe.
Some “modems” have extended AT commands to control voice calls… But hardware has to be designed to use it, since it’s uses miniPCIe pins for analog and/or PCM audio — but those go nowhere on Mikrotik. e.g. Sierra Wireless does this in some modems, and I think it was feature on some Qualcomm LTE modem chips, so likely others. But far from all do this & even if they do, still worthless from a Mikrotik.
You’d be better off using HTTP via /tool/fetch to some SaaS like Twilio, Cisco Spark, etc for some voice notification from Mikrotik.
Sites where mentioned solution could be used are off the internet, SIM cards without data services are used for now. Only way of reasonable notification is SMS, alternatively call. There is no need of speaker/microphone. But R11e-LTE works well on 2G network too or can perform CSFB from LTE.
Neverthless, for internet usecase “http fetch” would be reasonable better solution.
Another possibility is using SMS to send cloud (or to another another mobile connect to server/PC with internet) to listen on the SMS, to then make a Voice notification call from cloud/VoIP. Just using voice service, from a modem, is not a normal thing 
.