AudioCodes 405HD, Administrator'S Manual

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400HD Series IP Phones
Administrator's Manual 64 Document #: LTRT-11973
5.1.2.1
Configuring Proxy Redundancy
The Redundant Proxy feature allows the configuration of a backup SIP proxy server to
increase QoS stability. After the feature is enabled, the phone identifies cases where the
primary proxy does not respond to SIP signaling messages. In these scenarios, the phone
registers to the redundant proxy and the phone seamlessly continues normal functionality,
without the user noticing any connectivity failure or malfunction with the primary proxy.
The Redundant Proxy feature can operate in one of the following modes:

Asymmetric mode : The primary proxy is assigned a higher priority for registration
than the redundant proxy. Once the phone is registered to the primary proxy, it sends
keep-alive messages (using SIP OPTIONS messages) to the primary proxy. If the
primary proxy does not respond, the phone registers to the redundant proxy, but
continues sending keep-alive messages to the primary proxy . If the primary proxy
responds to these keep-alive messages, the phone re-registers to the primary
proxy.

Symmetric mode: Both proxies are assigned the same priority for registration. Once
the phone is registered to a proxy, it sends keep-alive messages to this proxy. The
phone switches proxies only once the proxy to which it has registered, does not
respond.
For more information see the voip/signalling/sip/redundant_proxy/symmetric_mode
description in the SIP Proxy Server Redundancy Parameters table below.
 To configure Proxy Redundancy:
• Use the table as reference.
Table 5-3: SIP Proxy Server Redundancy Parameters
Parameter Description
voip/signaling/sip/redundant_proxy/e
nabled
Mandatory for the phone to operate in redundancy.
Commands the phone to operate with the other
voip/signalling/sip/redundant_proxy parameters.
voip/signalling/sip/redundant_proxy/
mode
Mandatory for the phone to operate in redundancy. Defines
the two proxies' mode of operation: Primary-Fallback or
Simultaneous. Defines a backup SIP proxy server to
increase QoS stability. Enable the parameter if you want to
operate with a proxy server that will serve as a backup if
the first goes down.

Disable = (Default) Phone doesn't use redundant proxy.

Primary-Fallback = Phone registered to redundant
proxy if the primary proxy does not respond to SIP
signaling messages.

Simultaneous = Applies only in some environments. If
selected, dual registration is performed; the phone
registers simultaneously to both servers. .
voip/signalling/sip/redundant_proxy/
address
Only displayed if the 'Redundant Proxy Mode' parameter is
enabled (Primary-Fallback)
Defines the IP address of the backup proxy server. Default:
0.0.0.0
voip/signalling/sip/redundant_proxy/
keepalive_period
Only displayed if the 'Redundant Proxy Mode' parameter is
enabled (Primary-Fallback)
Defines how often a keep alive message is sent by the
phone to the proxy server.
Range: 0 to 300.
Default: Every 60 seconds.