Version 7.2 399 Mediant 500L Gateway & E-SBC
User's Manual 18. SIP Definitions
Parameter Description
sent to a different IP address, whichever is the
working one. In the case of proxy load-balancing,
there is no certainty as to which IP address in the
Proxy Set the request is routed.
[1] Enable = Enables the Register Stickiness feature.
Note: The parameter is applicable only if you have
enabled Account registration ('Register' parameter
configured to Regular or GIN).
Registrar Search Mode
registrar-search-mode
[Account_RegistrarSearchMode]
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.
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
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