AudioCodes Mediant 800B User Manual page 1214

Parameter
SBC Survivability Registration Time
configure voip > sbc settings > sbc-
surv-rgstr-time
[SBCSurvivabilityRegistrationTime]
configure voip > sbc
settings > sas-notice
[SBCEnableSurvivabilityNotice]
SBC Dialog-Info Interworking
configure voip > sbc settings > sbc-
dialog-info-interwork
[EnableSBCDialogInfoInterworking]
configure voip > sbc settings > sbc-
User's Manual
This feature is useful in scenarios where multiple users may
refresh their 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,
assume that the original 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.
Note:

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.
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.
Enables the device to notify Aastra IP phones that the device is
currently operating in Survivability mode.

[0] = Disable

[1] = Enable
For more information, see 'Enabling Survivability Display on
Aastra IP Phones' on page 729.
Enables the interworking of dialog information (parsing of call
identifiers in XML body) in SIP NOTIFY messages received
from a remote application server.

[0] Disable (default)

[1] Enable
For more information, see 'Interworking Dialog Information in
SIP NOTIFY Messages' on page 651.
Global parameter that enables the device to use the same call
1214
Mediant 800B Gateway & E-SBC
Description
Document #: LTRT-10298