I was thinking that 199 response is also helpful for a UAC to be able to decide when local ringing tone generation can be started again, when it was suppressed before due to arriving early media which was associated with a now terminated early dialog.
To highlight this I propose the following example to be added to section 4.2. Examples of policy procedures: "2. UAC ring tone generation - when a UAC receives a 180 response, it may choose to generate a local ringing tone. If early media is received, the UAC may stop the local ringback tone generation and play the incoming early media packets. If a 199 response is received on the early dialog associated with the early media, and the UAC has previously received a 180 response for another early dialog, it can start to generate local ringback tone again. Having knowledge that the early dialog associated with early media has been terminated, the UAC can also start generating local ringback tone if a 180 is received on another early dialog after the early dialog has been terminated." Best Regards, /Hans Erik van Elburg
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