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Possible solutions Solution 1 – add new protocol value to Reason header Impact on History-Info draft – would need to copy from 3xx response into History-Info header Or is copying Reason header desirable anyway? Solution 2 - add new redirection-reason URI parameter for use in Contact header No impact on History-Info draft (since URI copied anyway) Not strictly in accordance with the principle of URI parameters Solution 3 – define new 3xx response codes |