1227 Status-Line，Header

 

Status-Line  =  SIP-Version SP Status-Code SP Reason-Phrase CRLF

例如：        SIP/2.0       200          OK

 

header  =  "header-name" HCOLON header-value *(COMMA header-value)

例如：

From: Alice <sip:alice@atlanta.com>;tag=1928301774

CSeq: 314159 INVITE

 

Header fields can be extended over multiple lines by preceding each

   extra line with at least one SP or horizontal tab (HT).  The line

   break and the whitespace at the beginning of the next line are

   treated as a single SP character.  Thus, the following are

   equivalent:

      Subject: I know you're there, pick up the phone and talk to me!

      Subject: I know you're there,

               pick up the phone

               and talk to me!

   The following groups of header field rows are valid and equivalent:

 

      Route: <sip:alice@atlanta.com>

      Subject: Lunch

      Route: <sip:bob@biloxi.com>

      Route: <sip:carol@chicago.com>

 

      Route: <sip:alice@atlanta.com>, <sip:bob@biloxi.com>

      Route: <sip:carol@chicago.com>

      Subject: Lunch

 

      Subject: Lunch

      Route: <sip:alice@atlanta.com>, <sip:bob@biloxi.com>,

             <sip:carol@chicago.com>