The Nortel (now Avaya) BCM450 supports call recording internally, as long as you are running version 5.0 software.
You will need at least one seat (license) of a “Professional Call Recording” keycode before you can set it up.
Once you have that you can either:
– record a call manually, or
– record calls automatically that match certain criteria (i.e. all inbound calls, just one line, certain times of day . . .)
Third party options are available too. Try these links: