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Feature F-6484 adds two new fields to the SIP Advanced Settings object. The first field added is the Call Answer Timeout. Prior to the introduction of this feature, when making an Early-Media SIP call, the IMG 2020 allowed up to 3 minutes for the call to get established. If the call was not accepted by the remote gateway within that time frame, the call was canceled. The new functionality allows the user the ability to configure the Call Answer Timeout anywhere from 3 minutes to 60 minutes and during this timeout period, the call will not be canceled unless separate factors either internal or external are used.
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Right click on the Profiles object and select New SIP Profiles. A SIP Profiles object will get created. The SIP Profiles object is a parent or container object and no configuration is required. 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. Refer to the SIP Profile - SGP topic for more information on this object.
Right click on the SIP Profile object and select New SIP Advanced Settings. Highlight the value in the Call Answer Timeout field and enter a new value. In the screen capture below, 10 minutes was entered.
Refer to the topic for more information.
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To stop the extra 183 Session Progress messages from being sent, the 183 Periodic Retransmission field was added to disable the SIP A leg from sending retransmitted 183 Session Progress messages. Refer to the Call Flow diagram below.
In the call scenario above, the 183 Periodic Retransmission field is set to Disabled. In this scenario, the IMG 2020 does not transmit any of the subsequent retransmitted 183 Session Progress messages to the A Leg. Only the 183 Session Progress messages that are interworked from the B Leg are transmitted.
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