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Global SIP Settings
4-60 41-001343-02 REV04 – 05.2014
Configuring a Backup Outbound Proxy
To configure this feature an Administrator can set the following parameters in the configuration files or the Aastra Web
UI:
SIP Outbound Enabled and
backup proxy and backup registrar configured, • Establishes flow to the primary proxy and registrar.
• If the flow to the primary registrar fails, the phone:
– establishes flow to the backup registrar.
– registers to the backup registrar.
– attempts to reestablish flow to the primary registrar in the background.
– When the primary registrar comes back up, the phone unregisters from the backup
and registers with the primary.
• If the flow to the primary proxy fails, the phone:
– establishes flow to the backup proxy.
– registers the new AOR with the active registrar.
– moves subscriptions to the backup proxy.
– attempts to reestablish the flow to the primary proxy in the background.
• When the flow to the primary proxy is reestablished, the phone:
– registers the primary AOR to the active registrar.
– moves subscriptions to the primary proxy.
– unregisters/unsubscribes from the backup proxy/registrar.
backup proxy, backup registrar, and backup outbound
proxy configured,
Note:
This configuration assumes that the outbound proxy is
maintaining its own outbound connections to the
proxy/registrar.
• Establishes a flow to the primary outbound proxy.
• If the flow fails, the phone:
– establishes the flow to the backup proxy.
– registers the backup AOR to the backup registrar.
– moves subscriptions to the backup proxy.
– attempts to reestablish connection to the primary outbound proxy in the back-
ground.
• When the flow to the primary proxy is reestablished, the phone:
– registers the primary AOR to the primary registrar.
– moves the subscriptions to the primary proxy.
– unregisters/unsubscribes from the backup proxy/registrar.
backup outbound proxy configured only, • Establishes a flow to the primary outbound proxy.
• If the flow fails, the phone:
– establishes the flow to the backup proxy.
– registers the backup AOR to the backup registrar.
– moves subscriptions to the backup proxy.
Parameter Aastra Web UI Configuration Configuration File Configuration
sip outbound support - ✔
sip symmetric udp signaling - ✔
sip transport protocol ✔✔
Global Parameters
sip backup outbound proxy ✔✔
sip backup outbound proxy port ✔✔
Per-Line Parameters
sip lineN backup outbound proxy ✔✔
sip lineN backup outbound proxy port ✔✔
Note:
The “sip outbound support”, “sip symmetric udp signaling”, a nd “sip transport protocol” parameters are existing
parameters on the phone. For more information about these parameters, see Appendix A “SIP Outbound Support”,
“Symmetric UDP Signaling Setting”, and “Advanced SIP Settings”.