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The SIP History-Info Header defined in RFC 4244 provides a way of capturing any redirection information that may have occurred on a particular call. Without the SIP History-Info Header the redirecting information would be lost. The SIP History-Info Header is generated when a SIP request is re-targeted and can appear in any SIP request not associated with a dialog. The SIP History-Info header is generated by a User Agent or proxy and is passed from one entity to another through requests and responses. An example of the SIP History Header is shown below.
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The procedure below explains how to configure the IMG 2020 to capture any redirection information using the History-Info Header. Before configuring, the IMG 2020 must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding.
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Right click on the Profiles object and select New SIP Profiles. The SIP Profiles object is a parent or container object. No configuration is needed here. Refer to the SIP Profiles topic for more information on this object.
Right click on the SIP Profiles object and select New SIP Profile. The first profile that gets created is a Default SIP Profile and cannot be modified. Disregard this profile.
Right click on the SIP Profiles object and select New SIP Profile again. In the SIP Profile object that appears, either enter a name that identifies this SIP Profile or accept the default name already entered. In this example the SIP Profile was labeled HistoryInfo_Profile. Refer to the SIP Profile - SGP topic for more information on this object.
Right click on the SIP Profile object just created and select New SIP Headers. The Diversion Header Support feature is set to Disabled by default. To enable, select History-Info from drop down menu in the Diversion Header Support field. Refer to screen capture below.
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Refer to the SIP Profile - Headers topic for more information.
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The configuration above displays how to configure the SIP Profile and External SIP Gateway so that the SIP History-Info Header functionality is configured. The next step is to configure the SIP signaling stack and SIP Channel Groups. Refer to the Configure SIP (Single SIP IP) topic for a procedure on how to configure the SIP functionality.
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