CHAPTER72 Configuration Parameters Reference
Mediant 800 Gateway & E-SBC | User's Manual
Parameter Description
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 proxy-and-
registration >
registration-time-thres
[RegistrationTimeThreshold]
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.
'Re-register On INVITE Failure'
configure voip > sip-
definition proxy-and-
registration > reg-on-
invite-fail
[RegisterOnInviteFailure]
Enables immediate re-registration if no response is
received for an INVITE request sent by the device.
■ [0] Disable (default)
■ [1] Enable = The device immediately expires its re-
registration timer and commences re-registration to
the same Proxy upon any of the following scenarios:
✔ The response to an INVITE request is 407
(Proxy Authentication Required) without an
authentication header included.
✔ The remote SIP UA abandons a call before the
device has received any provisional response
(indicative of an outbound proxy server failure).
✔ The remote SIP UA abandons a call and the
only provisional response the device has
received for the call is 100 Trying (indicative of
a home proxy server failure, i.e., the failure of a
proxy in the route after the outbound proxy).
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