According to the shared log, you have enabled the music on hold class in the dial profiles of your extension:
Set(DIAL_OPTIONS=trm(moh2)b(set_dial^1)B(moh^1)):Set(DIAL_OPTIONS=trm(moh2)b(set_dial^1))") in new stack
This is a log of an internal call on my test environment:
Set(DIAL_OPTIONS=tTrb(set_dial^1)B(moh^1)):Set(DIAL_OPTIONS=tTrb(set_dial^1))") in new stack
As you see, in my test environment I have set the MoH class value to None(Ringback), and not MoH is delivered to the caller, instead a ring tone is played.
I recommend the following, after configure your PBX with the desired options, try executing this command on the Linux console:
php /usr/share/ombutel/scripts/dump_asterisk_conf
