MESSAGE sip:bob@example.invalid SIP/2.0
From: sip:alice@example.invalid;tag=45dfdf49
To: sip:bob@example.invalid
Call-ID: 1172299593a
CSeq: 1 MESSAGE
Content-Type: application/sdp
Max-Forwards: 2
X-Info: sdpops remove_line_by_prefix() test8 - empty body