Dedicated box
I can assure you its not isntalled and enabled by defualt, i've done 12 installs of SBC's to my pbx over the past year, it used to be installed however the last three i've done I am unable to putty into them from a local LAN under the same subnet
I have just installed on my side and i can see that the sshd service is running as expected without any issue.
I would suggest to go to the machine directly and run the command $ sudo systemctl status sshd
This should give you the below result. If this is the case you need also to check for any restriction on your network.