AudioCodes Mediant 4000 SBC, Руководство пользователя

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CHAPTER 20 SIP Definitions
Mediant 4000 SBC | User's Manual
Parameter Description
■ [1] According to IMS Specifications = For the initial
registration request, the device performs DNS
resolution if the address of the Proxy Set is configured
as an FQDN. It then attempts to register to one of the
listed DNS-resolved addresses (or configured IP
addresses), starting with the first listed address and
then going down the list sequentially. If an address
results in an unsuccessful registration, the device
immediately tries the next address (without waiting any
retry timeout). The device goes through the list of
addresses until an address results in a successful
registration. If registration is unsuccessful for all
addresses, the device waits a configured retry time and
then goes through the list again. Once initial registration
is successful, periodic registration refreshes are
performed as usual. In addition to the periodic
refreshes, immediate register refreshes are done upon
the following triggers according to the IMS
specification:
✔
The device receives a SIP 408, 480, or 403
response from the Serving IP Group in response to
an INVITE.
✔
The transaction timeout expires for an INVITE sent
to the Serving IP Group.
✔
The device receives an INVITE from the Serving IP
Group from an IP address other than the address to
which it is currently registered. In this case, it also
rejects the INVITE with a SIP 480 response.
If the device's physical Ethernet link to the proxy goes
down, the device re-registers this Account with the
proxy when the link comes up again. Re-registration
occurs even if proxy keep-alive is disabled.
Note: The parameter is applicable only if you have enabled
the Registrar Stickiness feature (in this table):
■ 'Register' parameter to Regular or GIN .
■ 'Registrar Stickiness' parameter to Enable or Enable
for Non-REGISTER Requests .
'Re-REGISTER on INVITE
Failure'
re-register-on-invite-
failure
[Account_
ReRegisterOnInviteFailure]
Enables the device to re-register an Account upon the
receipt of specific SIP response codes (e.g., 403, 408, and
480) for a failed INVITE message sent to the Serving IP
Group.
■ [0] Disable = (Default) If the device receives a SIP
response for a failed INVITE message, the device does
not re-register the Account.
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