@miconda I think this is the relevant table in section 20 link
Seems to be pretty clear, if I read it correctly.
-: The header field is not applicable.
"Not applicable" means that the header
field MUST NOT be present in a request. If one is placed in a
request by mistake, it MUST be ignored by the UAS receiving the
request. Similarly, a header field labeled "not applicable" for a
response means that the UAS MUST NOT place the header field in the
response, and the UAC MUST ignore the header field in the response.
Header field where proxy ACK BYE CAN INV OPT REG
___________________________________________________________
Contact R o - - m o o
Contact 1xx - - - o - -
Contact 2xx - - - m o o
Contact 3xx d - o - o o o
Contact 485 - o - o o o
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