Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question

Christian Groves <Christian.Groves@nteczone.com> Wed, 01 October 2014 22:40 UTC

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Date: Thu, 02 Oct 2014 08:40:09 +1000
From: Christian Groves <Christian.Groves@nteczone.com>
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Subject: Re: [MMUSIC] draft-ietf-mmusic-sctp-sdp-07 SCTP SDP syntax question
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Hello Paul,

I agree, good idea to use the new style.

Regards, Christian

On 2/10/2014 12:05 AM, Paul Kyzivat wrote:
> On 9/30/14 8:12 AM, Christian Groves wrote:
>
>> 2) Cl. 4.1.1 sctp-port: The syntax for sctp-port indicates the dual use
>> of "=", i.e.
>>
>> sctp-port-attr = "a=sctp-port=" portnumber
>> port-number = port
>>
>> That doesn't appear to be consistent with the example in clause 4 which
>> has:
>> a=sctp-port 4060
>>
>> To match that the syntax needs to be updated, something like:
>>
>> sctp-port-attr = "a=sctp-port" SP portnumber
>> port-number = port
>> I'm not sure why "portnumber" is used when "port" is commonly used in
>> clause 4.1?
>>
>> The syntax could be simplified to:
>> sctp-port-attr = "a=sctp-port" SP port
>
> The above is not a valid syntax for an SDP attribute. The value of an 
> attribute must be separated from the name by a ":".
>
> Please take a look at draft-ietf-mmusic-rfc4566bis-12 for more on this.
>
> That includes my proposal for cleaning up how attributes are defined. 
> I suggest using that style in this draft.
>
> In a similar vein, I suggest that when defining the new fmtp usage, 
> just provide the new syntax for format-specific-params, not for the 
> whole attribute.
>
> (While writing this I'm realizing that the new text defining the fmtp 
> parameter in 4566bis should specify *how* this should be done.)
>
>     Thanks,
>     Paul
>
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