[asterisk-users] users in sip.conf or in users.conf? what is the difference?

[yonoko molomo]

Hi,

I have a question which might be a bit simple for advanced users.
Where is the correct config file to define users in asterisk 1.4?

I was using sip.conf file and it was working fine.
Recently I installed an asterisk web interface and I see that new
users created using this web interface are added into the users.conf
file, and not into sip.conf

What is the difference between using sip.con or users.conf file to
configure sip users?

So I decided that it makes sense to put user definition in the
users.conf file. But sometimes I noticed that using users.conf
asterisk complains with some messages like:
"Registration from '<sip:xxxx at xxxxxx.xx>' failed for 'xxx.xxx.xxx.xxx'
- Device does not match ACL"

Now I'm not sure if there was something missing in the definition of
the user in users.conf file, but copying *exactly* the same user
definition lines in sip.conf was solving the problem.

Any idea?
Thanks