If it exists, the file addroverride contains the IP-address that should
be used instead of the hosts normal IP-address in SIP ACK messages. This
is useful if the host is behind a NAT firewall with port redirection to
the host's private address. The addroverride file then typically contains
the firewall's public IP address.

The file sipaliases contains the SIP server's (invitod) aliases database.
The aliases database is also used for SIP redirects, in which case the alias
to a name is on the form 'user$host', where host is the hostname or IP
address of the host that requests should be forwarded to. The aliases database
can be manually updated, and is also updated when the user issues a SIP REGISTER
request from confero. The hash sigh '#' on the beginning of a line indicates
a comment. An asterix '*' is a wildcasd for any name.
