Version 5.8
151
October 2009
SIP User's Manual
3. Web-Based Management
Parameter
Description
Web: Proxy Load Balancing
Method
EMS: Load Balancing Method
[ProxyLoadBalancingMethod]
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.
Web/EMS: Enable Proxy Keep
Alive
[EnableProxyKeepAlive]
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
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