[Sip] draft-ietf-sip-sctp-03.txt: comment on unordered delivery

[hbhondwe@hss.hns.com]

Hi,

In section 4.1 Mapping of SIP Transactions into Streams,
it says
"..a SIP entity SHOULD send every SIP message
   (request or response) over stream zero with the unordered flag set..."

Are there no SIP extensions which may require ordered delivery  from
SCTP(sip-isup mapping for instance)?
or is the 'SHOULD'  supposed to accommodate such exceptions?

Later in the same section, it is said "..Some applications introduce an
extra layer between the transport
   layer and SIP (e.g., compression and/or encryption). This extra layer
   sometimes requires ordered delivery of messages from the transport
   layer (e.g., TLS [6])."

The section then recommends using same stream for maintaining
sequence...but no mention is made about whether the unordered flag should
be set or not. To maintain sequence, in addition to choosing the same
stream, will it not be required that messages be also sent in sequence
within a stream(by not setting the unordered flag)?


regards
Harsh Bhondwe
Hughes Software Systems






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