{ 416, "Unsupported URI Scheme"},
{ 420, "Bad Extension"},
{ 421, "Extension Required"},
+ { 422, "Session Timer Too Small"},
{ 423, "Interval Too Brief"},
+ { 429, "Provide Referrer Identity"},
{ 480, "Temporarily Unavailable"},
{ 481, "Call/Transaction Does Not Exist"},
{ 482, "Loop Detected"},
{ 489, "Bad Event"},
{ 491, "Request Pending"},
{ 493, "Undecipherable"},
+ { 494, "Security Agreement Required"},
{ 499, "Client Error - Others"},
{ 500, "Server Internal Error"},