Support parsing SIP response with empty reason phrase #576
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According to RFC 3261, the BNF for SIP responses allows an empty reason
phrase. Relevant sections: 7.2 and 25.1
```
Status-Line = SIP-Version SP Status-Code SP Reason-Phrase CRLF
```
```
Reason-Phrase = *(reserved / unreserved / escaped
/ UTF8-NONASCII / UTF8-CONT / SP / HTAB)
```
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According to RFC 3261, the BNF for SIP responses allows an empty reason phrase. Relevant sections: 7.2 and 25.1