[SIPForum-discussion] help:Header Field Format?

Wed Dec 19 08:54:46 EST 2007

Hi, all
  Now , I meet a big problem in the SIP message parsing¡ªthe structure of header field:

  1.  field-name :  field-value
  on either side of the colon(":"), the arbitrary amount of whitespace is unlimited in theory. So what does the ¡°whitespace¡± mean? a SP or HTAB?

  2. a folding field-value
     If the SIP header field values be folded onto multiple lines. 
  For instance,

   Subject: This is a test    =>     Subject: This

                                        is a test

So on the two lines, which kind of character will follow the word ¡°This" and "test"as an end of each line?

Is there still a CRLF? before interpreting the field value of ¡°Subject¡±, should I use a single SP instead of  all the special spaces between ¡°This¡± and ¡°is¡±?

Moreover, is there any possible that these following fields to be split into a multiple line representation? 

          Call-ID, CSeq, From, Context-Type

  Merry Christmas!

  Nora

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