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The IMG 2020 has the ability to react when receiving the Retry-After Header in any one of the following responses after an INVITE message has been sent. Refer to SIP Retry-After Header - Transmit for information on the transmit side.
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The procedure below explains how to configure the IMG 2020 to respond to a received SIP Retry-After Header from a remote gateway if SIP congestion is determined. Before configuring the outbound SIP Retry-After feature, 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 Retry_After_Profile.
Right click on the SIP Profile object just created and select New SIP Advanced Settings. Verify the Retry-After Support field is defaulted to Enabled.
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Right click on the IMG 2020 physical node and select New Signaling. The Signaling object is a parent or container object and no configuration is needed here. Refer to the Signaling topic for more information on this object.
Right click on the Signaling object created and select New SIP. In the IP Operation Mode field, select whether the SIP stack will be configured for Single IP or Multiple IP Mode.
In the Retry-After field, enter the number of seconds (Range = 1 to 65535 seconds). This value will be transmitted back to the remote inbound gateway via the Retry-After header that is part of the 503 Service Unavailable response. Below in the Additional Information section there are two examples of how the Retry-After headers are formatted.
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Right click on the SIP Signaling object and select New SIP IP Address. Refer to the SIP Signaling - IP Address topic for more information on configuring the fields in this object.
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The configuration above displays how to configure the SIP Profile and SIP Signaling stack so the SIP Retry-After Header feature is configured. The next step is to configure the SIP Channel Group, SIP remote gateway, and any other remaining SIP objects not displayed in the configuration above. Refer to the Configure SIP (Single SIP IP) topic for a procedure that describes how to configure the remaining SIP functionality. This procedure can be used to finish the SIP configuration for this feature.
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