Ptime is media attribute. It can't be specified per codec.
>From 2327.
a=ptime:<packet time>
This gives the length of time in milliseconds represented by the
media in a packet. This is probably only meaningful for audio
data. It should not be necessary to know ptime to decode RTP or
vat audio, and it is intended as a recommendation for the
encoding/packetisation of audio. It is a media attribute, and is
not dependent on charset.
You can see some notes on usage of ptime in rfc3264.
>From RFC 4040.
Optional parameters: ptime, maxptime
"ptime" gives the length of time in milliseconds
represented by the media in a packet, as described in RFC
2327 [6].
"maxptime" represents the maximum amount of media, which
can be encapsulated in each packet, expressed as time in
milliseconds, as described in RFC 3267 [9].
Thanks,
Neel
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:sip-implementors-
> [EMAIL PROTECTED] On Behalf Of Manpreet Singh
> Sent: Wednesday, May 16, 2007 2:22 PM
> To: sip-implementors@cs.columbia.edu
> Subject: [Sip-implementors] ptime/Maxptime support in SDP
>
> Whats the right implementation for ptime/maxptime in the SDP. I read few
> recommendations but what is the correct way of doing it?
>
> m=audio 22836 RTP/AVP 4 18
> c=IN IP4 216.168.161.230
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=yes;ptime=20
> a=maxptime:40
> a=rtpmap:4 G723/8000
> a=fmtp:4 bitrate=6.3;annexa=yes;ptime=30
> a=maxpime:60
>
> OR
>
> m=audio 22836 RTP/AVP 4 18
> c=IN IP4 216.168.161.230
> a=rtpmap:18 G729/8000
> a=fmtp:18 annexb=yes;
> a=ptime:20
> a=maxptime:40
> a=rtpmap:4 G723/8000
> a=fmtp:4 bitrate=6.3;annexa=yes
> a=ptime:30
> a=maxpime:60
>
> is this how we can define ptime and maxptime per media attribute? Any
> place
> this has been defined?
>
> Thanks
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