SIP User Agent Redundancy

Overview

The SIP software supports redundancy allowing the SIP UA to continue functioning after a Matrix Controller switchover.

In an CSP with redundant Matrix Controller cards, the cards themselves are physically identical.

Important! To enable SIP UA Redundancy, you must configure a shared IP address. The shared IP address is for redundancy only. All API message should be sent directly to the active matrix card’s IP address - not to the shared IP address.

Description

All communication to the Matrix Controller cards are over this one shared IP address. You create this shared IP configuration using DHCP or BOOTP. See Redundant Matrix Controller Cards in the API Developer’s Guide: Overview for general information about redundancy on the Matrix Controller card.

The two matrix cards communicate with each other over a High-Level Data Link Control (HDLC) link. The SIP software data structures are dynamically updated from the active Matrix Controller to the standby Matrix Controller on this midplane bus so calls in the connected or answered state are maintained during a switchover. Calls in transition are dropped.

Figure 5-4 SIP UA Redundancy

Configuring

See either of the following two procedures in the Application Development chapter of the Developer’s Guide: Overview to set up the shared IP address:

Configuring a Shared IP Address Using BOOTP Server

Configuring a Shared IP Address Using DHCP Server