AudioCodes Mediant 4000 SBC User Manual page 856

Parameter
Registration Time Threshold
configure voip > sip-definition
proxy-and-registration >
registration-time-thres
[RegistrationTimeThreshold]
ReRegister On Connection
Failure
configure voip > sip-definition
settings > reg-on-conn-failure
[ReRegisterOnConnectionFailure]
configure voip > sip-definition
settings > expl-un-reg
[UnregistrationMode]
User's Manual
a fixed time to wait between registration attempts due to
registration failure, this parameter configures the device to
increase the time-to-wait interval for each subsequent registration
attempt (per RFC 5626, Section 4.5) for a specific registration
flow. In other words, the interval changes between registration
attempts.
The parameter operates together with the RegistrationRetryTime
parameter. When the MaxRegistrationBackoffTime parameter is
configured, the wait-time before another registration attempt
increases after each failed registration (until it reaches the
maximum value specified by the parameter).
The device uses the following algorithm to calculate the
incremental augmented wait-time between each registration
attempt:
Wait Time = min (max-time, (base-time * (2 ^
consecutive-failures)))
Where:

max-time is the value configured by
MaxRegistrationBackoffTime

base-time is the value configured by RegistrationRetryTime
For example, if max-time is 1800 seconds and base-time is 30
seconds, and there were three consecutive registration failures,
then the upper-bound wait time is the minimum of (1800,
30*(2^3)), which is (1800, 240) and thus, the minimum of the two
values is 240 (seconds). The actual time the device waits before
retrying registration is computed by a uniform random time
between 50% and 100% of the upper-bound wait time (e.g., for
an upper-bound wait-time of 240, the actual wait-time is between
120 and 240 seconds). As can be seen from the algorithm, the
upper-bound wait time can never exceed the value of the
MaxRegistrationBackoffTime parameter.
Defines a threshold (in seconds) for re-registration timing. If the
parameter is greater than 0, but lower than the computed re-
registration timing (according to the parameter
RegistrationTimeDivider), the re-registration timing is set to the
following: timing set by the Registration server in the SIP Expires
header minus the value of the parameter
RegistrationTimeThreshold.
The valid range is 0 to 2,000,000. The default is 0.
Enables the device to perform SIP re-registration upon TCP/TLS
connection failure.

[0] Disable (default)

[1] Enable
Enables the device to perform explicit unregisters.

[0] Disable (default)

[1] Enable = The device sends an asterisk ("*") value in the
SIP Contact header, instructing the Registrar server to remove
all previous registration bindings. The device removes SIP
User Agent (UA) registration bindings in a Registrar, according
to RFC 3261. Registrations are soft state and expire unless
refreshed, but they can also be explicitly removed. A client can
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Mediant 4000 SBC
Description
Document #: LTRT-40203