Administrator's Manual
4. Configuration File-based Management
Version 1.4
79
July 2010
Parameter
Description
voip/signalling/sip/redun
dant_proxy/symmetric_
mode
Determines the proxy redundancy mode.
[0]
(default) - Asymmetric mode.
[1]
- Symmetric mode.
The Redundant Proxy feature allows the configuration of a backup SIP proxy
server to increase QoS stability. Once this 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 includes two operational modes:
Asymmetric mode:
the primary proxy is assigned a higher priority for
registration than the redundant proxy. In the Asymmetric mode, 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. Therefore, the phone assigns the primary
proxy a higher priority for registration.
Symmetric mode:
both proxies are assigned the same priority for
registration. In the Symmetric mode, 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.
Therefore, the phone assigns both proxies the same priority for registration
In both modes, the following applies:
If the phone is not registered (i.e., if the proxy server¬–redundant or
primary–to which the phone currently tries to register does not respond),
the phone attempts to register to an alternative proxy. These attempts
continue until the phone successfully registers.
If this feature is enabled and the user reboots the phone, the phone
registers to the last proxy to which it was trying to register, and not
necessarily to the primary proxy.
Note
: This parameter is applicable only if the parameter
use_redundant_proxy
is set to 1.
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