AudioCodes Mediant 1000 User Manual page 74

Table 5-4: Proxy & Registration Parameters (continues on pages 72 to 78)
Parameter
Proxy Load Balancing
Method
[ProxyLoadBalancingMe
thod]
Proxy IP List Refresh
Time
[ProxyIPListRefreshTim
e]
Enable Proxy Keep Alive
[EnableProxyKeepAlive]
Proxy Keep Alive Time
[ProxyKeepAliveTime]
SIP User's Manual
Description
Enables the usage of the Proxy Load Balancing mechanism.
Valid options include:
0 = Load Balancing is disabled (default).
1 = Round Robin.
2 = Random Weights.
When Round Robin (1) algorithm is used, a list of all possible Proxy IP addresses is
compiled. This list includes all entries in the ProxyIP table after necessary DNS
resolutions (including NAPTR and SRV, if configured). This list can handle up to 15
entries.
After this list is compiled, the Proxy Keep-Alive mechanism (according to
EnableProxyKeepAlive and ProxyKeepAliveTime) is used to mark each entry as
Offline or Online. The balancing is only performed on Proxy servers that are marked
as Online.
All outgoing messages are equally distributed across the Proxy IP list. REGISTER
messages are also distributed unless a RegistrarIP is configured.
The Proxy IP 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 Random Weights (2) 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 gateway sends the requests in such a fashion that
each Proxy receives a percentage of the requests according to its assigned weight.
Load Balancing is not used in the following scenarios:
The ProxyIP table includes more than one entry.
The only Proxy defined is an IP address and not an FQDN.
SRV usage is not enabled (DNSQueryType).
The SRV response includes several records with a different Priority value.
Defines the time interval (in seconds) between refreshes of the Proxy IP list. This
parameter is used only when ProxyLoadBalancingMethod = 1.
The interval range is 5 to 2,000,000. The default interval is 60.
Determines whether Keep-Alive with the Proxy is enabled or disabled.
Valid options include:
0 = Disable (default)
1 = Enable Keep alive with Proxy using OPTIONS
2 = Enable Keep alive with Proxy using REGISTER
If EnableProxyKeepAlive = 1, SIP OPTIONS message is sent every
ProxyKeepAliveTime. If EnableProxyKeepAlive = 2, SIP REGISTER message is
sent every RegistrationTime. Any response from the Proxy, either success (200 OK)
or failure (4xx response) is considered as if the Proxy is correctly communicating.
Note 1: This parameter must be set to 1 (OPTIONS) when Proxy redundancy is
used.
Note 2: When EnableProxyKeepAlive = 2 (REGISTER), the homing redundancy
mode is disabled.
Note 3: When the active proxy does not respond to INVITE messages sent by the
gateway, the proxy is marked as offline. The behavior is similar to a Keep-Alive
(OPTIONS or REGISTER) failure.
Defines the Proxy keep-alive time interval (in seconds) between Keep-Alive
messages.
The default value is 60 seconds.
Note: This parameter is applicable only if EnableProxyKeepAlive = 1 (OPTIONS).
When EnableProxyKeepAlive = 2 (REGISTER), the time interval between Keep-
Alive messages is determined by the parameter RegistrationTime.
74
Mediant 1000
Document #: LTRT-83301