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SIP line proxy concepts

If you configure an outbound proxy, then all SIP messages are sent to it for transmission. For each proxy you can specify one or more proxy addresses.

The list of proxy addresses indicates the order in which they are tried. All messages are sent to the first proxy address in this list. The remaining proxy addresses are used only if the first proxy address is not operational. "Not operational" means that CIC did not receive any response from the proxy and the request timed out.

If any response is received from the proxy then the proxy selection operation is considered complete, regardless of the response value.

This proxy list is intended to be used only when the proxies are considered to be "cold-standbys" of each other, meaning that only one is operational at a time.

If you intend to use the proxies as "hot-standbys" or N+1 configurations, then use SIP lines and line groups instead.

For example:

Assign one proxy per SIP line. Assign multiple SIP lines into one line group. This method orders proxies alphanumerically by line name. It enables the use of different hunt selection methods.
Assign one proxy per SIP line. Assign one SIP line into one line group. You can then arrange the line group list in Dial Plan Dial Group List. This method allows the selection of one proxy as the main proxy regardless of the line name.

Each SIP line contains a configurable list of response codes that can be retried. The response codes can be used to determine when or if the next SIP line or line group is attempted.