AudioCodes Mediant 500 E-SBC, User Manual, Page: 258 / 920

User's Manual 258 Document #: LTRT-10437
Mediant 500 E-SBC
Parameter Description
addresses, which is necessary for calls between LAN and WAN.

When the global parameter SBCDirectMedia is disabled, Media
Anchoring can only be enabled for calls between endpoints
belonging to the same SRD.

For more information on Media Anchoring, see No Media
Anchoring (Anti-Tromboning) on page
451 .
Block Unregistered Users
CLI: block-un-reg-users
[SRD_BlockUnRegUsers] Determines whether the device blocks (rejects) incoming calls
(INVITE requests) from unregistered users (pertaining to User-type
IP Groups) for the SRD.

[0] No = Calls from unregistered users are not blocked (default).

[1] Yes = Blocks calls from unregistered users.
Note: When the call is blocked, the device sends a SIP 500 "Server
Internal Error" response to the remote end.
Max. Number of Registered
Users
CLI: max-reg-users
[SRD_MaxNumOfRegUsers] Maximum number of users belonging to this SRD that can register
with the device. By default, no limitation exists for registered users
Enable Un-Authenticated
Registrations
CLI: enable-un-auth-registrs
[SRD_EnableUnAuthenticated
Registrations] Enables the deviceto 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 deviceforwards the REGISTER request to the proxy and if
authenticated by the proxy (i.e., devicereceives a success response),
the deviceadds 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 devicecan
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 devicerejects REGISTER requests from new
users that were not authenticated by a proxy server.

[1] Enable = (Default) The deviceaccepts 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.