The RECORD request starts the audio streaming. The RTP-Info header contains the following parameters:

seq16-bitinitial RTP sequence number
rtptime32-bitinitial RTP timestamp

Example: start audio stream

client → server

RECORD rtsp://fe80::217:f2ff:fe0f:e0f6/3413821438 RTSP/1.0
CSeq: 5
Session: 1
Range: npt=0-
RTP-Info: seq=20857;rtptime=1146549156
User-Agent: iTunes/10.6 (Macintosh; Intel Mac OS X 10.7.3) AppleWebKit/535.18.5
Client-Instance: 56B29BB6CB904862
DACP-ID: 56B29BB6CB904862
Active-Remote: 1986535575

server → client

RTSP/1.0 200 OK
Audio-Latency: 2205
Server: AirTunes/130.14
CSeq: 5