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Page 2 of 16
20.1 Accept
The Accept header field follows the syntax defined in [H14.1]. The
semantics are also identical, with the exception that if no Accept
header field is present, the server SHOULD assume a default value of
application/sdp.
An empty Accept header field means that no formats are acceptable.
Example:
Header field where proxy ACK BYE CAN INV OPT REG
___________________________________________________________
Accept R - o - o m* o
Accept 2xx - - - o m* o
Accept 415 - c - c c c
Accept-Encoding R - o - o o o
Accept-Encoding 2xx - - - o m* o
Accept-Encoding 415 - c - c c c
Accept-Language R - o - o o o
Accept-Language 2xx - - - o m* o
Accept-Language 415 - c - c c c
Alert-Info R ar - - - o - -
Alert-Info 180 ar - - - o - -
Allow R - o - o o o
Allow 2xx - o - m* m* o
Allow r - o - o o o
Allow 405 - m - m m m
Authentication-Info 2xx - o - o o o
Authorization R o o o o o o
Call-ID c r m m m m m m
Call-Info ar - - - o o o
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
Content-Disposition o o - o o o
Content-Encoding o o - o o o
Content-Language o o - o o o
Content-Length ar t t t t t t
Content-Type * * - * * *
CSeq c r m m m m m m
Date a o o o o o o
Error-Info 300-699 a - o o o o o
Expires - - - o - o
From c r m m m m m m
In-Reply-To R - - - o - -
Max-Forwards R amr m m m m m m
Min-Expires 423 - - - - - m
MIME-Version o o - o o o
Organization ar - - - o o o
Table 2: Summary of header fields, A--O
Header field where proxy ACK BYE CAN INV OPT REG
___________________________________________________________________
Priority R ar - - - o - -
Proxy-Authenticate 407 ar - m - m m m
Proxy-Authenticate 401 ar - o o o o o
Proxy-Authorization R dr o o - o o o
Proxy-Require R ar - o - o o o
Record-Route R ar o o o o o -
Record-Route 2xx,18x mr - o o o o -
Reply-To - - - o - -
Require ar - c - c c c
Retry-After 404,413,480,486 - o o o o o
500,503 - o o o o o
600,603 - o o o o o
Route R adr c c c c c c
Server r - o o o o o
Subject R - - - o - -
Supported R - o o m* o o
Supported 2xx - o o m* m* o
Timestamp o o o o o o
To c(1) r m m m m m m
Unsupported 420 - m - m m m
User-Agent o o o o o o
Via R amr m m m m m m
Via rc dr m m m m m m
Warning r - o o o o o
WWW-Authenticate 401 ar - m - m m m
WWW-Authenticate 407 ar - o - o o o
Table 3: Summary of header fields, P--Z; (1): copied with possible
addition of tag
Accept: application/sdp;level=1, application/x-private, text/html
