AudioCodes Mediant 4000 SBC User Manual page 314

Parameter
Enable Un-Authenticated
Registrations
enable-un-auth-registrs
[SRD_EnableUnAuthenticat
edRegistrations]
User's Manual
(SIPInterface_BlockUnRegUsers) is configured to any value other
than default [-1] for a SIP Interface that is associated with the SRD,
the parameter in the SRDs table is ignored for calls belonging to
the SIP Interface.
Enables the device to accept REGISTER requests and register them
in its registration database from new users that have not been
authenticated by a proxy/registrar server (due to proxy down) and
thus, re-routed to a User-type IP Group.
In normal operation scenarios in which the proxy server is available,
the device forwards the REGISTER request to the proxy and if
authenticated by the proxy (i.e., device receives a success response),
the device adds the user to its registration database. The routing to the
proxy is according to the SBC IP-to-IP Routing table where the
destination is the proxy's IP Group. However, when the proxy is
unavailable (e.g., due to network connectivity loss), the device can
accept REGISTER requests from new users if a matching alternative
routing rule exists in the SBC IP-to-IP Routing table where the
destination is the user's User-type IP Group (i.e., call survivability
scenarios) and if the parameter is enabled.

[0] Disable = The device rejects REGISTER requests from new
users that were not authenticated by a proxy server.

[1] Enable = (Default) The device accepts REGISTER requests
from new users even if they were not authenticated by a proxy
server, and registers the user in its registration database.
Note:

Regardless of the parameter, the device always accepts
registration refreshes from users that are already registered in its
database.

For a SIP Interface that is associated with the SRD, if the
corresponding parameter in the SIP Interfaces table
(SIPInterface_EnableUnAuthenticatedRegistrations) is configured
to Disable or Enable, the parameter in the SRD is ignored for calls
belonging to the SIP Interface.
314
Mediant 4000 SBC
Description
Document #: LTRT-41729