---

---

The first line of a Response message is the Status-Line, consisting of the protocol version followed by a numeric Status-Code and its associated textual phrase, with each element separated by SP characters. No CR or LF is allowed except in the final CRLF sequence.

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

---

Posted by george99

The status line at the beginning of the response message differentiates the message
froma request message. This line consists of the protocol version followed by a numeric
status-code and its associated textual phrase, with each element separated by a single
space (SP) character.
The status line contains the following information: SIP version, SIP status code, and
the SIP reason phrase. The first digit of the status code defines the class of response.
The last two digits do not carry any specific meaning, but the range of the status code
defines the type of response code.

---

Posted by sagitraz