User's Manual 1060 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Parameter Description
after 3600 x 70% (i.e., 2520 sec).
Note:
The parameter may be overridden if the parameter
RegistrationTimeThreshold is greater than 0.
Registration Retry Time
configure voip > sip-definition
settings > registration-retry-time
[RegistrationRetryTime]
Defines the time interval (in seconds) after which a registration
request is re-sent if registration fails with a 4xx response or if
there is no response from the Proxy/Registrar server.
The default is 30 seconds. The range is 10 to 3600.
Note: Registration retry time can also be configured with the
MaxRegistrationBackoffTime parameter.
Max Registration Backoff Time
configure voip > sip-
definition proxy-and-
registration > max-
registration-backoff-time
[MaxRegistrationBackoffTime]
Defines a dynamic time-to-wait interval before the device
attempts to regi
ster the SIP entity again after a registration failure.
The parameter is applicable only to registrations initiated by the
device on behalf of SIP entities (for example, User Info, Accounts,
Endpoints or the device itself) with a SIP proxy server (registrar).
The valid value is 0 to 3000000 (i.e., 3 million seconds). The
default is 0 (i.e., disabled).
In contrast to the RegistrationRetryTime parameter, which defines
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.
Registration Time Threshold
configure voip > sip-definition
Defines a threshold (in seconds) for re-registration timing. If the
parameter is greater than 0, but lower than the computed re-
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