AudioCodes Mediant 1000 User Manual page 156

Parameter
Proxy Load Balancing
Method
[ProxyLoadBalancing
Method]
Enable Proxy Keep
Alive
[EnableProxyKeepAli
ve]
SIP User's Manual
Enables the Proxy Load Balancing mechanism per Proxy Set ID.
[0] Disable = Load Balancing is disabled (default).
[1] Round Robin = Round Robin.
[2] Random Weights = Random Weights.
When the Round Robin algorithm is used, a list of all possible Proxy IP
addresses is compiled. This list includes all IP addresses per Proxy Set,
after necessary DNS resolutions (including NAPTR and SRV, if configured).
After this list is compiled, the Proxy Keep-Alive mechanism (according to
parameters EnableProxyKeepAlive and ProxyKeepAliveTime) tags each
entry as 'offline' or 'online'. Load balancing is only performed on Proxy
servers that are tagged as 'online'.
All outgoing messages are equally distributed across the list of IP addresses.
REGISTER messages are also distributed unless a RegistrarIP is
configured.
The IP addresses list is refreshed according to ProxyIPListRefreshTime. If a
change in the order of the entries in the list occurs, all load statistics are
erased and balancing starts over again.
When the Random Weights algorithm is used, the outgoing requests are not
distributed equally among the Proxies. The weights are received from the
DNS server by using SRV records. The device sends the requests in such a
fashion that each Proxy receives a percentage of the requests according to
its' assigned weight. A single FQDN should be configured as a Proxy IP
address. The Random Weights Load Balancing is not used in the following
scenarios:
The Proxy Set includes more than one Proxy IP address.
The only Proxy defined is an IP address and not an FQDN.
SRV is not enabled (DNSQueryType).
The SRV response includes several records with a different Priority value.
Determines whether Keep-Alive with the Proxy is enabled or disabled. This
parameter is configured per Proxy Set.
[0] Disable = Disable (default).
[1] Using OPTIONS = Enables Keep-Alive with Proxy using OPTIONS.
[2] Using REGISTER = Enable Keep-Alive with Proxy using REGISTER.
If set to 'Using OPTIONS', the SIP OPTIONS message is sent every user-
defined interval, as configured by the parameter ProxyKeepAliveTime. If set
to 'Using REGISTER', the SIP REGISTER message is sent every user-
defined interval, as configured by the parameter RegistrationTime. Any
response from the Proxy, either success (200 OK) or failure (4xx response)
is considered as if the Proxy is communicating correctly.
Notes:
This parameter must be set to 'Using OPTIONS' when Proxy redundancy
is used.
When this parameter is set to 'Using REGISTER', the homing redundancy
mode is disabled.
When the active proxy doesn't respond to INVITE messages sent by the
device, the proxy is tagged as 'offline'. The behavior is similar to a Keep-
Alive (OPTIONS or REGISTER) failure.
Description
156
Mediant 1000 & Mediant 600
Document #: LTRT-83303