dial-peer authenticaton in ios 12.3?

[Gregory Edigarov <greg () bestnet kharkov ua>]

Hello everybody,

Is there a good person who could try to remember how to configure
authentication in dial-peer on IOS (tm) MC3810 Software
(MC3810-A2ISV5-M), Version 12.3(13), RELEASE SOFTWARE (fc2)?

dial-peer voice 1 pots
   authentication username someuser password somepassword

does not seem to be any help as it points an error on "authentication"
keyword.

Is there anything I could try to do about this before I through it out
from my balcony?

Thank you.

-- 
With best regards,
        Gregory Edigarov