Solved, thanks to Artis Bernāts from
support@mikrotik.com for helping with that.
The 3g modem e3372h-153 with STICK firmware - sometimes on ROS 7 it sends wrong PPP chanel settings and thats why its not working.
By the these commands i've tried manually found the working channel:
/system serial-terminal usb1 channel=0
And for second channel
/system serial-terminal usb1 channel=1
Checked what modem responds by sending the following commands using serial terminal
ate1
ati
at+cpin?
at+cfun?
at+cgdcont?
at+cgact?
atd*99#
The last command will trigger ppp connection should return "CONNECT".
So i figured out that everything is working on 1 channel only not on both 0 and 1.
1.JPG
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