AudioCodes E-SBC User Manual page 502

CHAPTER 20 SIP Definitions
Parameter
'Registrar Search Mode'
registrar-search-mode
[Account_
RegistrarSearchMode]
Mediant 1000 Gateway & E-SBC | User's Manual
Description
■ [2] Enable for Non-REGISTER Requests = Enables
the Register Stickiness feature, as described for the
Enable option (above), except for refresh REGISTER
messages. When the device initiates a refresh
REGISTER message for the Account, it restarts the
registration process for the Account, sending the
message to one of the registrar servers according to the
Proxy Set of the Account's Serving IP Group. This
option can used, for example, in scenarios where proxy
keep-alive is disabled (see the 'Proxy Keep-Alive'
parameter in the Proxy Sets table) and restart of
registration for refresh REGISTERs is always
preferred.
Note: The parameter is applicable only if you have enabled
Account registration ('Register' parameter configured to
Regular or GIN).
Defines the method for choosing an IP address (registrar) in
the Proxy Set (associated with the Serving IP Group) to
which the Account initially registers and performs
registration refreshes, when the Register Stickiness
feature is enabled. Once chosen, the Account is binded to
the IP address for subsequent SIP requests.
■ [0] Current Working Server = (Default) For each initial
and refresh registration request, the device routes to the
currently working server in the list of IP addresses
(configured or DNS-resolved IP addresses) in the Proxy
Set. In the case of proxy load-balancing, the chosen IP
address is according to the load-balancing mechanism.
■ [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.
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