"14.2 UAS Behaviour" 
mentions that a 500 (Server Internal Error) needs to include a
Retry-After header field ico. the 2nd invite is received before the
final response of the 1st INVITE is not sent yet.

"20.33 Retry-After" 
this header field can be used with 503, 404, 413, 480, 486, 600 or 603.

I assume that this list should include the 500 too?

[rfc2543bis-09]

Thanks,
Diether
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