<s>
The	O
Real-time	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
(	O
RTP	O
)	O
specifies	O
a	O
general-purpose	O
data	O
format	O
and	O
network	O
protocol	O
for	O
transmitting	O
digital	O
media	O
streams	O
on	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
networks	O
.	O
</s>
<s>
The	O
format	O
parameters	O
of	O
the	O
RTP	O
payload	O
are	O
typically	O
communicated	O
between	O
transmission	O
endpoints	O
with	O
the	O
Session	B-Language
Description	I-Language
Protocol	I-Language
(	O
SDP	B-Language
)	O
,	O
but	O
other	O
protocols	O
,	O
such	O
as	O
the	O
Extensible	B-Protocol
Messaging	I-Protocol
and	I-Protocol
Presence	I-Protocol
Protocol	I-Protocol
(	O
XMPP	B-Protocol
)	O
may	O
be	O
used	O
.	O
</s>
<s>
RFC	O
3551	O
,	O
entitled	O
RTP	O
Profile	O
for	O
Audio	O
and	O
Video	O
(	O
RTP/AVP	B-Protocol
)	O
,	O
specifies	O
the	O
technical	O
parameters	O
of	O
payload	O
formats	O
for	O
audio	O
and	O
video	O
streams	O
.	O
</s>
<s>
Applications	O
should	O
always	O
support	O
PCMU	B-Algorithm
(	O
payload	O
type	O
0	O
)	O
;	O
previously	O
,	O
DVI4	O
(	O
payload	O
type	O
5	O
)	O
was	O
also	O
recommended	O
,	O
but	O
this	O
was	O
removed	O
in	O
2013	O
by	O
RFC	O
7007	O
.	O
</s>
<s>
For	O
instance	O
,	O
video	O
codecs	O
typically	O
use	O
a	O
clock	O
rate	O
of	O
90000	O
so	O
their	O
frames	O
can	O
be	O
more	O
precisely	O
aligned	O
with	O
the	O
RTCP	O
NTP	O
timestamp	O
,	O
even	O
though	O
video	O
sampling	O
rates	O
are	O
typically	O
in	O
the	O
range	O
of	O
1	O
–	O
60	O
samples	O
per	O
second.Frame	O
size	O
(	O
byte	O
)	O
Default	O
packet	O
interval	O
(	O
ms	O
)	O
DescriptionReferences0PCMUaudio18000any20ITU-T	O
G.711	B-Algorithm
PCM	B-Algorithm
μ-Law	B-Algorithm
audio	O
64	O
kbit/sRFC	O
35511reserved	O
(	O
previously	O
FS-1016	B-Algorithm
CELP	B-Algorithm
)	O
audio18000reserved	O
,	O
previously	O
FS-1016	B-Algorithm
CELP	B-Algorithm
audio	O
4.8	O
kbit/sRFC	O
3551	O
,	O
previously	O
RFC	O
18902reserved	O
(	O
previously	O
G721	O
or	O
G726-32	O
)	O
audio18000reserved	O
,	O
previously	O
ITU-T	O
G.721	B-Algorithm
ADPCM	B-Algorithm
audio	O
32	O
kbit/s	O
or	O
ITU-T	O
G.726	B-Algorithm
audio	O
32	O
kbit/sRFC	O
3551	O
,	O
previously	O
RFC	O
18903GSMaudio180002020European	O
GSM	B-Algorithm
Full	I-Algorithm
Rate	I-Algorithm
audio	O
13	O
kbit/s	O
(	O
GSM	B-Algorithm
06.10	I-Algorithm
)	O
RFC	O
35514G723audio180003030ITU-T	O
G.723.1	B-Algorithm
audioRFC	O
35515DVI4audio18000any20IMA	O
ADPCM	B-Algorithm
audio	O
32	O
kbit/sRFC	O
35516DVI4audio116000any20IMA	O
ADPCM	B-Algorithm
audio	O
64	O
kbit/sRFC	O
35517LPCaudio18000any20Experimental	O
Linear	B-Algorithm
Predictive	I-Algorithm
Coding	I-Algorithm
audio	O
5.6	O
kbit/sRFC	O
35518PCMAaudio18000any20ITU-T	O
G.711	B-Algorithm
PCM	B-Algorithm
A-Law	B-Algorithm
audio	O
64	O
kbit/sRFC	O
35519G722audio18000any20ITU-T	O
G.722	B-Algorithm
audio	O
64	O
kbit/sRFC	O
3551	O
-	O
Page	O
1410L16audio244100any20Linear	O
PCM	B-Algorithm
16-bit	O
Stereo	O
audio	O
1411.2	O
kbit/s	O
,	O
uncompressed	O
RFC	O
3551	O
,	O
Page	O
2711L16audio144100any20Linear	O
PCM	B-Algorithm
16-bit	O
audio	O
705.6	O
kbit/s	O
,	O
uncompressed	O
RFC	O
3551	O
,	O
Page	O
2712QCELPaudio180002020Qualcomm	O
Code	O
Excited	O
Linear	O
PredictionRFC	O
2658	O
,	O
RFC	O
355113CNaudio18000Comfort	O
noise	O
.	O
</s>
<s>
Payload	O
type	O
used	O
with	O
audio	O
codecs	O
that	O
do	O
not	O
support	O
comfort	O
noise	O
as	O
part	O
of	O
the	O
codec	O
itself	O
such	O
as	O
G.711	B-Algorithm
,	O
G.722.1	B-Algorithm
,	O
G.722	B-Algorithm
,	O
G.726	B-Algorithm
,	O
G.727	B-Algorithm
,	O
G.728	B-Algorithm
,	O
GSM	B-Algorithm
06.10	I-Algorithm
,	O
Siren	B-Algorithm
,	O
and	O
RTAudio.RFC	O
338914MPAaudio1	O
,	O
2900008	O
–	O
72MPEG-1	O
or	O
MPEG-2	B-Algorithm
audio	O
onlyRFC	O
3551	O
,	O
RFC	O
225015G728audio180002.520ITU-T	O
G.728	B-Algorithm
audio	O
16	O
kbit/sRFC	O
355116DVI4audio111025any20IMA	O
ADPCM	B-Algorithm
audio	O
44.1	O
kbit/sRFC	O
355117DVI4audio122050any20IMA	O
ADPCM	B-Algorithm
audio	O
88.2	O
kbit/sRFC	O
355118G729audio180001020ITU-T	O
G.729	B-Algorithm
and	O
G.729a	B-Algorithm
audio	O
8	O
kbit/s	O
;	O
Annex	O
B	O
is	O
implied	O
unless	O
the	O
annexb	O
=	O
no	O
parameter	O
is	O
usedRFC	O
3551	O
,	O
Page	O
20	O
,	O
RFC	O
3555	O
,	O
Page	O
1519reserved	O
(	O
previously	O
CN	O
)	O
audioreserved	O
,	O
previously	O
comfort	O
noiseRFC	O
355125CELLBvideo90000Sun	O
CellB	O
videoXIL	O
Programmer	O
's	O
Guide	O
,	O
Chapter	O
22	O
"	O
CellB	O
Codec	O
"	O
.	O
</s>
<s>
Retrieved	O
on	O
2014-07-19.RFC	O
202926JPEGvideo90000JPEG	O
videoRFC	O
243528nvvideo90000Xerox	O
PARC	O
's	O
Network	O
Video	O
(	O
nv	O
)	O
nv	O
-	O
network	O
video	O
on	O
Henning	O
Schulzrinne	O
's	O
website	O
,	O
Network	O
Video	O
on	O
The	O
University	O
of	O
Toronto	O
's	O
website	O
,	O
Retrieved	O
on	O
2009-07-09.Ron	O
Frederick	O
Github	O
with	O
source	O
codeRFC	O
3551	O
,	O
Page	O
3231H261video90000ITU-T	O
H.261	B-Algorithm
videoRFC	O
458732MPVvideo90000MPEG-1	O
and	O
MPEG-2	B-Algorithm
videoRFC	O
225033MP2Taudio/video90000MPEG	O
-2	O
transport	O
streamRFC	O
225034H263video90000H.263	O
video	O
,	O
first	O
version	O
(	O
1996	O
)	O
RFC	O
3551	O
,	O
RFC	O
219072	O
–	O
76reservedreserved	O
because	O
RTCP	O
packet	O
types	O
200	O
–	O
204	O
would	O
otherwise	O
be	O
indistinguishable	O
from	O
RTP	O
payload	O
types	O
72	O
–	O
76	O
with	O
the	O
marker	O
bit	O
setRFC	O
3550	O
,	O
RFC	O
355177	O
–	O
95unassignednote	O
that	O
RTCP	O
packet	O
type	O
207	O
(	O
XR	O
,	O
Extended	O
Reports	O
)	O
would	O
be	O
indistinguishable	O
from	O
RTP	O
payload	O
types	O
79	O
with	O
the	O
marker	O
bit	O
setRFC	O
3551	O
,	O
RFC	O
3611dynamicH263-1998video90000H.263	O
video	O
,	O
second	O
version	O
(	O
1998	O
)	O
RFC	O
3551	O
,	O
RFC	O
4629	O
,	O
RFC	O
2190dynamicH263-2000video90000H.263	O
video	O
,	O
third	O
version	O
(	O
2000	O
)	O
RFC	O
4629dynamic	O
(	O
or	O
profile	O
)	O
H264	B-Application
AVCvideo90000H.264	O
video	O
(	O
MPEG-4	B-Application
Part	I-Application
10	I-Application
)	O
RFC	O
6184	O
,	O
previously	O
RFC	O
3984dynamic	O
(	O
or	O
profile	O
)	O
H264	B-Application
SVCvideo90000H.264	O
videoRFC	O
6190dynamic	O
(	O
or	O
profile	O
)	O
H265video90000H.265	O
video	O
(	O
HEVC	B-Algorithm
)	O
RFC	O
7798dynamic	O
(	O
or	O
profile	O
)	O
theoravideo90000Theora	O
videodraft-barbato-avt-rtp-theoradynamiciLBCaudio1800020	O
,	O
3020	O
,	O
30Internet	O
low	O
Bitrate	O
Codec	O
13.33	O
or	O
15.2	O
kbit/sRFC	O
3952dynamicPCMA-WBaudio1160005ITU-T	O
G.711.1	B-Algorithm
A-lawRFC	O
5391dynamicPCMU-WBaudio1160005ITU-T	O
G.711.1	B-Algorithm
μ-lawRFC	O
5391dynamicG718audio32000	O
(	O
placeholder	O
)	O
20ITU-T	O
G.718draft-ietf-payload-rtp-g718dynamicG719audio(various )	O
4800020ITU-T	O
G.719RFC	O
5404dynamicG7221audio16000	O
,	O
3200020ITU-T	O
G.722.1	B-Algorithm
and	O
G.722.1	B-Algorithm
Annex	O
CRFC	O
5577dynamicG726-16audio18000any20ITU-T	O
G.726	B-Algorithm
audio	O
16	O
kbit/sRFC	O
3551dynamicG726-24audio18000any20ITU-T	O
G.726	B-Algorithm
audio	O
24	O
kbit/sRFC	O
3551dynamicG726-32audio18000any20ITU-T	O
G.726	B-Algorithm
audio	O
32	O
kbit/sRFC	O
3551dynamicG726-40audio18000any20ITU-T	O
G.726	B-Algorithm
audio	O
40	O
kbit/sRFC	O
3551dynamicG729Daudio180001020ITU-T	O
G.729	B-Algorithm
Annex	O
DRFC	O
3551dynamicG729Eaudio180001020ITU-T	O
G.729	B-Algorithm
Annex	O
ERFC	O
3551dynamicG7291audio1600020ITU-T	O
G.729.1RFC	O
4749dynamicGSM-EFRaudio180002020ITU-T	O
GSM-EFR	B-Algorithm
(	O
GSM	B-Algorithm
06.60	I-Algorithm
)	O
RFC	O
3551dynamicGSM-HR-08audio1800020ITU-T	O
GSM-HR	B-Algorithm
(	O
GSM	B-Algorithm
06.20	I-Algorithm
)	O
RFC	O
5993dynamic	O
(	O
or	O
profile	O
)	O
AMRaudio(various )	O
800020Adaptive	O
Multi-Rate	O
audioRFC	O
4867dynamic	O
(	O
or	O
profile	O
)	O
AMR-WBaudio(various )	O
1600020Adaptive	O
Multi-Rate	O
Wideband	O
audio	O
(	O
ITU-T	O
G.722.2	B-Algorithm
)	O
RFC	O
4867dynamic	O
(	O
or	O
profile	O
)	O
AMR-WB	B-Algorithm
+audio1	O
,	O
2	O
or	O
omit7200013.3	O
–	O
40Extended	O
Adaptive	O
Multi	O
Rate	O
–	O
WideBand	O
audioRFC	O
4352dynamic	O
(	O
or	O
profile	O
)	O
vorbisaudio(various )	O
(	O
various	O
)	O
Vorbis	B-Algorithm
audioRFC	O
5215dynamic	O
(	O
or	O
profile	O
)	O
opusaudio1	O
,	O
2480002.5	O
–	O
6020Opus	O
audioRFC	O
7587dynamic	O
(	O
or	O
profile	O
)	O
speexaudio18000	O
,	O
16000	O
,	O
3200020Speex	O
audioRFC	O
5574dynamicmpa-robustaudio1	O
,	O
29000024	O
–	O
72Loss-Tolerant	O
MP3	B-Application
audioRFC	O
5219	O
(	O
previously	O
RFC	O
3119	O
)	O
dynamic	O
(	O
or	O
profile	O
)	O
MP4A-LATMaudio90000	O
or	O
othersMPEG-4	O
Audio	O
(	O
includes	O
AAC	O
)	O
RFC	O
6416	O
(	O
previously	O
RFC	O
3016	O
)	O
dynamic	O
(	O
or	O
profile	O
)	O
MP4V-ESvideo90000	O
or	O
othersMPEG-4	O
VisualRFC	O
6416	O
(	O
previously	O
RFC	O
3016	O
)	O
dynamic	O
(	O
or	O
profile	O
)	O
mpeg4-genericaudio/video90000	O
or	O
otherMPEG-4	O
Elementary	O
StreamsRFC	O
3640dynamicVP8video90000VP8	O
videoRFC	O
7741dynamicVP9video90000VP9	O
videodraft-ietf-payload-vp9dynamicL8audio(various )	O
(	O
various	O
)	O
any20Linear	O
PCM	B-Algorithm
8-bit	O
audio	O
with	O
128	O
offsetRFC	O
3551	O
Section	O
4.5.10	O
and	O
Table	O
5dynamicDAT12audio(various )	O
(	O
various	O
)	O
any20	O
(	O
by	O
analogy	O
with	O
L16	O
)	O
IEC	O
61119	O
12-bit	O
nonlinear	O
audioRFC	O
3190	O
Section	O
3dynamicL16audio(various )	O
(	O
various	O
)	O
any20Linear	O
PCM	B-Algorithm
16-bit	O
audioRFC	O
3551	O
Section	O
4.5.11	O
,	O
RFC	O
2586dynamicL20audio(various )	O
(	O
various	O
)	O
any20	O
(	O
by	O
analogy	O
with	O
L16	O
)	O
Linear	B-Algorithm
PCM	I-Algorithm
20-bit	O
audioRFC	O
3190	O
Section	O
4dynamicL24audio(various )	O
(	O
various	O
)	O
any20	O
(	O
by	O
analogy	O
with	O
L16	O
)	O
Linear	B-Algorithm
PCM	I-Algorithm
24-bit	O
audioRFC	O
3190	O
Section	O
4dynamicrawvideo90000Uncompressed	O
VideoRFC	O
4175dynamicac3audio(various )	O
32000	O
,	O
44100	O
,	O
48000Dolby	O
AC-3	O
audioRFC	O
4184dynamiceac3audio(various )	O
32000	O
,	O
44100	O
,	O
48000Enhanced	O
AC-3	O
audioRFC	O
4598dynamict140text1000Text	O
over	O
IPRFC	O
4103dynamicEVRCEVRC0EVRC1audio8000EVRC	O
audioRFC	O
4788dynamicEVRCBEVRCB0EVRCB1audio8000EVRC-B	O
audioRFC	O
4788dynamicEVRCWBEVRCWB0EVRCWB1audio16000EVRC-WB	O
audioRFC	O
5188dynamicjpeg2000video90000JPEG	O
2000	O
videoRFC	O
5371dynamicUEMCLIPaudio8000	O
,	O
16000UEMCLIP	O
audioRFC	O
5686dynamicATRAC3audio44100ATRAC3	O
audioRFC	O
5584dynamicATRAC-Xaudio44100	O
,	O
48000ATRAC3+	O
audioRFC	O
5584dynamicATRAC-ADVANCED-LOSSLESSaudio(various )	O
ATRAC	O
Advanced	O
Lossless	O
audioRFC	O
5584dynamicDVvideo90000DV	O
videoRFC	O
6469	O
(	O
previously	O
RFC	O
3189	O
)	O
dynamicBT656videoITU-R	O
BT.656	B-Device
videoRFC	O
3555dynamicBMPEGvideoBundled	O
MPEG-2	B-Algorithm
videoRFC	O
2343dynamicSMPTE292MvideoSMPTE	O
292M	O
videoRFC	O
3497dynamicREDaudioRedundant	O
Audio	O
DataRFC	O
2198dynamicVDVIaudioVariable-rate	O
DVI4	O
audioRFC	O
3551dynamicMP1SvideoMPEG-1	O
Systems	O
Streams	O
videoRFC	O
2250dynamicMP2PvideoMPEG-2	O
Program	O
Streams	O
videoRFC	O
2250dynamictoneaudio8000	O
(	O
default	O
)	O
toneRFC	O
4733dynamictelephone-eventaudio8000	O
(	O
default	O
)	O
DTMF	O
toneRFC	O
4733dynamicaptxaudio2	O
–	O
6(equal to sampling rate )	O
4000	O
÷	O
sample	O
rate4For	O
aptX	B-Algorithm
,	O
the	O
packetization	O
interval	O
must	O
be	O
rounded	O
down	O
to	O
the	O
nearest	O
packet	O
interval	O
that	O
can	O
contain	O
an	O
integer	O
number	O
of	O
samples	O
.	O
</s>
