[AVT] Comments on draft-ietf-avt-rfc2793bis-08

[Magnus Westerlund <magnus.westerlund at ericsson.com>]

Hi

I have reviewed the draft and it looks good. However I have a few comments:

1. I think there are a few places where the draft is implicitly breaking 
the restriction of text/RED. When having defined a PT it implies a 
certain number of levels of redundancy. However the draft does not seem 
to keep to this. Examples where it is unclear are:
- Section 5.3, last paragraph on page 11.
- Second paragraph in Section 7.2

2. Section 9.
  "The congestion considerations from section 10 of RFC 3550 [2],
   section 6 of RFC 2198 [3] and the section about congestion in
   chapter 2 of RFC 3551 [11] apply with the following application
   specific considerations."

I would like to change this sentence to be applicable for any profile:

   The congestion considerations from section 10 of RFC 3550 [2],
   section 6 of RFC 2198 [3] and any used profile, e.g. the section
   about congestion in chapter 2 of RFC 3551 [11], apply with the
   following application specific considerations.

3. Section 9:
   -With the (unusually high) load of 20 characters per second, in a
   language that make use of three octets UTF-8 characters, no header
   compression, two redundant levels and 300 ms between transmissions,
   the maximum load of this application is 3300 bits/s.

   -When the restrictions mentioned above are applied, limiting
   transmission to 10 characters per second, using 5 s between
   transmissions, the maximum load of this application in a language
   that uses one octet per UTF-8 character is 300 bits/s.

Could you please clarify what is included in the bit-rate calculations. 
Currently I don't know if they include more than RTP header or not.

4. Section 10.3:
"The MIME type ("text") goes in SDP "m=" as the media name. "

Please change to:

The MIME type ("text" or "audio") goes in SDP "m=" as the media name.

For clarity.


Cheers

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
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Torshamsgatan 23           | Fax   +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: magnus.westerlund at ericsson.com


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