Nokia 2112 or 2280 Fbus commands?

I'm working on the Nokia CDMA phones Fbus protocol based on Gnokii and Gammu command descriptions.

The 2112 and the 2280 accept some commands such as the ReadPhoneBook, but didn't do nothing with the Dial voice cal, Hangup and Answer incoming call commands.
The syntax seems to be equal to the Nokia GSM 3100 or the 6510.

I have already tried everything I found trying to make/receive voice calls on these phones.

My guess is that they simply don't have these commands.

Any ideas on this?
Thanks.