Terry,
The "a=ptime:" is a media level attribute, which makes it specific to
the "m=" line. It does not work on a per-codec basis, and the
suggestion that "the ptime value corresponds to the previous codec
specified in the attribute list" is incorrect.
Colin
On 9 Sep 2005, at 18:56, Lyons, Terry wrote:
Is this a valid concept, "codec specific attribute"?
SDP says ptime "is a media attribute".
- [EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, September 07, 2005 1:33 AM
To: Kool Guy
Cc: [EMAIL PROTECTED];
[email protected]
Subject: Re: [Sip-implementors] Multiple ptime attributes in the SDP
Hi,
ptime is a codec specific attribute. The ptime value corresponds to
the
previous codec specified in the attribute list. The multiple ptime
attribute can be represented as follows:
m=audio 49230 RTP/AVP 96 97 98
a=rtpmap:96 L8/8000
a=ptime:20
a=rtpmap:97 L16/8000
a=ptime:25
a=rtpmap:98 L16/11025/2
In the above, ptime=20 corresponds to L8 codec and ptime=25
corresponds to
L16.
Regards
Partha
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R.Parthasarathi
Flextronics Software Systems (FSS)- B'lore- India
Off: +91-80-51069088 Mob: +91-9448383781
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