Version 6.8 621 Mediant 2600 E-SBC
User's Manual 43. Configuration Parameters Reference
Parameter Description
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 this parameter, and then subtracts this random
number from the original expiry time value. For example, assume
that the original expiry time is 120 and this 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 this
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.
Web: SBC Proxy Registration
Time
CLI: sbc-prxy-rgstr-time
[SBCProxyRegistrationTime]
Defines the duration (in seconds) for which the user is registered in
the proxy database (after the device forwards the REGISTER
message). When set to 0, the device sends the Expires header's
value as received from the user to the proxy.
The valid range is 0 to 2,000,000 seconds. The default is 0.
Web: SBC Survivability
Registration Time
CLI: sbc-surv-rgstr-time
[SBCSurvivabilityRegistration
Time]
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
set by the SBCUserRegistrationTime parameter for the device's
response.
The valid range is 0 to 2,000,000 seconds. The default is 0.
[SBCEnableSurvivabilityNotic
e]
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"?>
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