Re: [MMUSIC] Feedback requested on requirements

[Christer Holmberg <[e-mail]>]

Hi,

>Here are a few desiderata related to dealing with legacy devices, both
>endpoints and intermediate devices:
>
>   DES C3  Avoid using media types in m= lines other than audio and
>      video unless required for user media, as some SBCs reject SDP that
>      uses other media types.
>
>   This desideratum was suggested by Hadriel Kaplan.

I am not sure I understand. Why would one use media types unless required for user media?

>   DES C4  Any additional m= lines prescribed by the bundle mechanism
>      should be ordered after the constituent m= lines.

That is normal Offer/Answer procedure, isn't it?

>   Many devices that have only one audio or video channel accept the
>   first m= line with that media type and reject any further ones
>
>  non-DES C5  SBCs generally pass through attributes that they do not
>      understand.  SBCs generally pass through codec specifications that
>      they do not understand, even if they are configured to transcode
>     certain specific codecs.
>
>   This non-desideratum was suggested by Hadriel Kaplan.

I don't understand this.

Regards,

Christer