[asterisk-users] what is the magic needed from upgrading from 1.4 to 1.6

[Jerry Geis]

I am upgrading a box from 1.4 to 1.6 and my console/dsp stopped working.

I am getting a SIP/401 Unauthorized error and then a SIP/404 error.
I changed nothing in the configs.

Is there a particular parameter needed for 1.6 that 1.4 did not care about?
If I drop back to 1.4 it starts working again.

Thanks

Jerry