Use Domain as Realm
Use the domain from the SIP Domains setting as the realm. In this case, the realm will be based on
the request 'to' or 'from' header and should match one of the domain. Otherwise, the configured
'realm' value will be used.
Always Auth Reject
When an incoming INVITE or REGISTER is to be rejected, for any reason, always reject with an
identical response equivalent to valid username and invalid password/hash instead of letting the
requester know whether there was a matching user or peer for their request. This reduces the
ability of an attacker to scan for valid SIP usernames. This option is set to 'yes' by default.
Authenticate Options
Requests
Enabling this option will authenticate OPTIONS requests just like INVITE requests are. By default this
option is disabled.
Allow Guest Calling
Allow or reject guest calls (default is yes, to allow). If your gateway is connected to the Internet and
you allow guest calls, you want to check which services you offer everyone out there, by enabling
them in the default context.
Media
Figure 4-3-10 Media Settings