AudioCodes Mediant 500 E-SBC, User Manual

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User's Manual 54. Configuration Parameters Reference
Version 6.8 899 Mediant 500 E-SBC
Parameter Description
EMS: Redundant Proxy Set
CLI: rdcy-sas-proxy-set
[RedundantSASProxySet]
mode for fallback when the user is not found in the Registered
Users database. Each time a new SIP request arrives, the SAS
application checks whether the user is listed in the registration
database. If the user is located in the database, the request is
sent to the user. If the user is not found, the request is forwarded
to the next redundant SAS defined in the Redundant SAS Proxy
Set. If that SAS Proxy IP appears in the Via header of the
request, it is not forwarded (thereby, preventing loops in the
request's course). If no such redundant SAS exists, the SAS
sends the request to its default gateway (configured by the
parameter SASDefaultGatewayIP).
The valid range is -1 to 5. The default is -1 (i.e., no redundant
Proxy Set).
Web/EMS: SAS Block
Unregistered Users
CLI: sas-block-unreg-usrs
[SASBlockUnRegUsers]
Determines whether the device rejects SIP INVITE requests
received from unregistered SAS users. This applies to SAS
Normal and Emergency modes.

[0] Un-Block = (Default) Allow INVITE from unregistered SAS
users.

[1] Block = Reject dialog-establishment requests from un-
registered SAS users.
CLI: sas-contact-replace
[SASEnableContactReplace]
Enables the device to change the SIP Contact header so that it
points to the SAS host and therefore, the top-most SIP Via
header and the Contact header point to the same host.

[0] (default) = Disable - when relaying requests, the SAS
agent adds a new Via header (with the SAS IP address) as
the top-most Via header and retains the original Contact
header. Thus, the top-most Via header and the Contact
header point to different hosts.

[1] = Enable - the device changes the Contact header so that
it points to the SAS host and therefore, the top-most Via
header and the Contact header point to the same host.
Note: Operating in this mode causes all incoming dialog
requests to traverse the SAS, which may cause load problems.
Web: SAS Survivability Mode
EMS: Survivability Mode
CLI: sas-survivability
[SASSurvivabilityMode]
Determines the Survivability mode used by the SAS application.

[0] Standard = (Default) Incoming INVITE and REGISTER
requests are forwarded to the defined Proxy list of
SASProxySet in Normal mode and handled by the SAS
application in Emergency mode.

[1] Always Emergency = The SAS application does not use
Keep-Alive messages towards the SASProxySet, instead it
always operates in Emergency mode (as if no Proxy in the
SASProxySet is available).

[2] Ignore Register = Use regular SAS Normal/Emergency
logic (same as option [0]), but when in Normal mode
incoming REGISTER requests are ignored.

[3] Auto-answer REGISTER = When in Normal mode, the
device responds to received REGISTER requests by sending
a SIP 200 OK (instead of relaying the registration requests to
a Proxy), and enters the registrations in its SAS database.

[4] Use Routing Table only in Normal mode = The device
uses the IP-to-IP Routing table to route IP-to-IP SAS calls
only when in SAS Normal mode (and is unavailable when
SAS is in Emergency mode). This allows routing of SAS IP-