User's Manual 1036 Document #: LTRT-89730
Mediant 3000
Parameter Description
registration or subscription simultaneously, thereby causing the device to
handle many such sessions at a given time. This may result in an
overload of the device (reaching maximum session capacity), thereby
preventing the establishment of new calls or preventing the handling of
some user registration or subscription requests. When this feature is
enabled, the device assigns a random expiry time to each user
registration or subscription and thus, ensuring future user registration
and subscription requests are more distributed over time (i.e., do not all
occur simultaneously).
The device takes any random number between 0 and the value
configured by the parameter, and then subtracts this random number
from the original expiry time value. For example, as
expiry time is 120 and the parameter is set to 10. If the device randomly
chooses the number 5 (i.e., between 0 and 10), the resultant expiry time
will be 115 (120 minus 5).
The valid value is 0 to 20. The default is 10. If set to 0, the device does
not change the expiry time.
Notes:
 The lowest expiry time that the device sends in the 200 OK,
regardless of the resultant calculation, is 10 seconds. For example, if
the original expiry time is 12 seconds and the parameter is set to 5,
theoretically, the new expiry time can be less than 10 (e.g., 12 – 4 =
8). However, the expiry time will be set to 10.
 The expiry time received from the user can be changed by the device
before forwarding it to the proxy. This is configured by the
SBCUserRegistrationTime parameter.
SBC Survivability
Registration Time
[SBCSurvivabilityRegistrat
ionTime]
Defines the duration of the periodic registrations between the user and
the device, when the device is in survivability state (i.e., when
REGISTER requests cannot be forwarded to the proxy and are
terminated by the device). When set to 0, the device uses the value set
by the SBCUserRegistrationTime parameter for the device's response.
The valid range is 0 to 2,000,000 seconds. The default is 0.
[SBCEnableSurvivabilityN
otice]
Enables the device to notify Aastra IP phones that the device is currently
operating in Survivability mode. When this occurs, the Aastra IP phones
display the message, "Stand Alone Mode" on their LCD screens.
Survivability mode occurs when connectivity with the WAN fails and as a
result, the device enables communication between IP phone users within
the LAN enterprise.
 [0] = Disable
 [1] = Enable
When this feature is enabled and the SBC device is in Survivability
mode, it responds to SIP REGISTER messages from the IP phones with
a SIP 200 OK containing the following XML body:
Content-Type: application/xml
<?xml version="1.0" encoding="utf-8"?>
<LMIDocument version="1.0">
<LocalModeStatus>
<LocalModeActive>true</LocalModeActive>
<LocalModeDisplay>StandAlone
Mode</LocalModeDisplay>
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