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.
Web/EMS: Is Proxy
Hot-Swap
CLI: control-network
proxy-set > is-proxy-
hot-swap
[ProxySet_IsProxyH
otSwap]
Enables the Proxy Hot-Swap redundancy mode.
[0] No (default)
[1] Yes
If Proxy Hot-Swap is enabled, the SIP INVITE/REGISTER message is
initially sent to the first Proxy/Registrar server. If there is no response from
the first Proxy/Registrar server after a specific number of retransmissions
(configured by the parameter HotSwapRtx), the message is resent to the
next redundant Proxy/Registrar server.
Web/EMS:
Redundancy Mode
CLI: control-network
proxy-set > proxy-
redundancy-mode
[ProxySet_ProxyRed
undancyMode]
Determines whether the device switches back to the primary Proxy after
using a redundant Proxy.
[-1] Not configured = (Default) The global parameter,
ProxyRedundancyMode applies.
[0] Parking = The device continues operating with a redundant (now
active) Proxy until the next failure, after which it operates with the next
redundant Proxy.
[1] Homing = The device always attempts to operate with the primary
Proxy server (i.e., switches back to the primary Proxy whenever it's
available).
Notes:
To use the Proxy Redundancy mechanism, you need to enable the
keep-alive with Proxy option, by setting the parameter
EnableProxyKeepAlive to 1 or 2.
If this parameter is configured, then the global parameter is ignored.
Web/EMS: SRD Index
CLI: control-network
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