Tech-invite  3GPPspace  IETFspace
SIP ↠  Examples  Grammars  Presence ⇾
SIP  SIP‑URI  SIP Headers  SIP P‑Headers  SDP  Generic URI  ABNF Notation
Session Description  Addressing  generic rules  "a=" SDP Attributes
List   Prev   Next
SDP attributes defined in

RFC 3312 – Preconditions for session establishment

RFC 3312 – Section 4
a=curr   a=des   a=conf

 

attribute-fields  =/
current‑status /  desired‑status /  confirm‑status
current-status =
"a=curr:"  precondition‑type  SP  status‑type  SP  direction‑tag  CRLF
Top
desired-status =
"a=des:"  precondition‑type  SP  strength‑tag  SP  status‑type  SP  direction‑tag  CRLF
Top
confirm-status =
"a=conf:"  precondition‑type  SP  status‑type  SP  direction‑tag  CRLF
Top
precondition-type =
"qos" /  ; Quality of Service  RFC 3312 – Section 4
"sec" /  ; Security  RFC 5027 – Section 3
"conn" /  ; Connectivity  RFC 5898 – Section 3
token
; see  IANA
Up
Up
Up
strength-tag =
( "mandatory"  /  "optional" /  "none" /  "failure" /  "unknown" )
Up
status-type =
( "e2e"  /  "local" /  "remote" )
Up
Up
Up
direction-tag =
( "none"  /  "send" /  "recv" /  "sendrecv" )
Up
Up
Up

Top