CHAPTER60 Configuration Parameters Reference
Mediant 4000 SBC | User's Manual
Parameter Description
In certain scenarios (depending on the value of this parameter), the
device considers the proxy as offline (down) for the number of
seconds specified in the Retry-After header. During this timeout, the
device does not send any SIP messages to the proxy. This condition
is indicated in the Syslog message as "server is now Unavailable -
setting Retry-After timer to x secs".
■ [1] = (Default) Handle Locally. The device considers the proxy as
offline regardless of the type of SIP message sent to the proxy
for which the 503 response was received.
■ [0] = Transparent. The behavior depends on the type of SIP
message sent to the proxy for which the 503 response was
received:
✔ SIP OPTIONS message: The device considers the proxy as
offline.
✔ SIP REGISTER message generated (created) by the
device: The device does not send REGISTER messages to
the proxy for this specific registration process (i.e.,
Accounts table or User Information table) during the timeout
specified in the Retry-After header of the 503 response.
However, the device considers the proxy as online and
therefore, it continues sending traffic of other entities to the
proxy.
✔ All other SIP dialogs (e.g., INVITE): The device ignores the
Retry-After header and forwards the 503 response
transparently to the other user agent.
'Retry-After Time'
configure voip >
sip-definition
settings >
retry-aftr-time
[RetryAfterTime]
Defines the time (in seconds) used in the Retry-After header when a
503 (Service Unavailable) response is generated by the device.
The time range is 0 to 3,600. The default is 0.
'Fake Retry After'
fake-retry-after
[FakeRetryAfter]
Determines whether the device, upon receipt of a SIP 503 response
without a Retry-After header, behaves as if the 503 response
included a Retry-After header and with the period (in seconds)
specified by the parameter.
■ [0] Disable (default)
■ Any positive value (in seconds) for defining the period
When enabled, this feature allows the device to operate with Proxy
servers that do not include the Retry-After SIP header in SIP 503
(Service Unavailable) responses to indicate an unavailable service.
The Retry-After header is used with the 503 (Service Unavailable)
response to indicate how long the service is expected to be
unavailable to the requesting SIP client. The device maintains a list
of available proxies, by using the Keep-Alive mechanism. The
device checks the availability of proxies by sending SIP OPTIONS
every keep-alive timeout to all proxies.
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