2011/7/28 Iñaki Baz Castillo <[email protected]>:
> I know that RFC 2833 or 4733/4734 do not mandate a specific payload
> value for DTMF, but AFAIK values below 100 are reserved, am I wrong?
> This is, values below 100 are supposed to indicate standarized values
> (as some codecs). Please correct me if I'm wrong.
I'm wrong, the first payload dynamic value is 96 as Valdelrmar Pamesi
pointed out some time ago in this maillist replying to me:
---------------------------------------
rfc3551 defines codec names which can be used in SDP while IANA maps
codecs names to a number known as payload number
Registry:
PT encoding name audio/video (A/V) clock rate (Hz) channels
(audio) Reference
-------- -------------- ----------------- ---------------
---------------- ---------
0 PCMU A 8000 1
[RFC3551]
1 Reserved
2 Reserved
3 GSM A 8000 1
[RFC3551]
4 G723 A 8000 1
[Kumar]
5 DVI4 A 8000 1
[RFC3551]
6 DVI4 A 16000 1
[RFC3551]
7 LPC A 8000 1
[RFC3551]
8 PCMA A 8000 1
[RFC3551]
9 G722 A 8000 1
[RFC3551]
10 L16 A 44100 2
[RFC3551]
11 L16 A 44100 1
[RFC3551]
12 QCELP A 8000 1
13 CN A 8000 1
[RFC3389]
14 MPA A 90000
[RFC3551][RFC2250]
15 G728 A 8000 1
[RFC3551]
16 DVI4 A 11025 1
[DiPol]
17 DVI4 A 22050 1
[DiPol]
18 G729 A 8000 1
19 Reserved A
20 Unassigned A
21 Unassigned A
22 Unassigned A
23 Unassigned A
24 Unassigned V
25 CelB V 90000
[RFC2029]
26 JPEG V 90000
[RFC2435]
27 Unassigned V
28 nv V 90000
[RFC3551]
29 Unassigned V
30 Unassigned V
31 H261 V 90000
[RFC4587]
32 MPV V 90000
[RFC2250]
33 MP2T AV 90000
[RFC2250]
34 H263 V 90000
[Zhu]
35-71 Unassigned ?
72-76 Reserved for RTCP conflict avoidance
[RFC3551]
77-95 Unassigned ?
96-127 dynamic ?
[RFC3551]
--
Iñaki Baz Castillo
<[email protected]>
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