MP-20x Telephone Adapter 42 Document #: LTRT-50609
User's Manual
5.1.1 Configuring Proxy Redundancy
The Redundant Proxy feature allows the configuration of a backup SIP proxy server to
increase Quality of Service (QoS). Once this feature is enabled, MP-20x identifies cases
where the primary proxy does not respond to SIP signaling messages. In these cases, MP-
20x registers to the redundant proxy and seamlessly continues normal functionality, without
any noticeable connectivity failure or malfunction with the primary proxy.
The Redundant Proxy feature includes two operational modes:
Asymmetric mode: this mode assigns the primary proxy a higher priority for
registration over the redundant proxy. Once MP-20x 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, MP-20x 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, MP-20x re-registers to the primary proxy.
Symmetric mode: in this mode, both proxies are assigned the same priority for
registration. Once MP-20x is registered to a proxy (primary or redundant), it sends
keep-alive messages to this proxy. MP-20x switches proxies only once the proxy to
which it has registered does not respond.
In both modes, the following applies:
If MP-20x is not registered (i.e., if the proxy server - redundant or primary - to which
MP-20x currently tries to register does not respond), MP-20x attempts to register to an
alternative proxy. These attempts continue until MP-20x successfully registers.
If this feature is enabled and you reboot MP-20x, it registers to the last proxy to which
it was trying to register (not necessarily to the primary proxy).
¾ To configure proxy redundancy:
1. From the left sidebar, click the Voice Over IP menu; the 'Signaling Protocol' tab
screen appears.
2. Define a primary proxy server, by performing the following:
a. Under the group 'SIP Proxy and Registrar', select one of the following check
boxes: 'Use SIP Registrar' or 'Use SIP Proxy IP and Port for SIP Proxy IP and
Port for Registration'.
b. In the 'Host Name or Address' field, enter the primary proxy's IP address.
c. In the 'Proxy Port' field, enter the primary proxy's port number.
3. Define a redundancy proxy server, by performing the following:
a. Under the group 'SIP Proxy and Registrar', select the 'Use Redundant Proxy'
check box; additional fields relating to proxy redundancy appears.
b. In the 'Redundant Proxy Address' field, enter the redundant proxy's IP address or
DNS name.
c. In the 'Redundant Proxy Port' field, enter the redundant proxy's port number.
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