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[MMUSIC] 4566bis-36: Ignoring/rejecting session description that contains unknown letter

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 24 July 2019 09:49 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: 4566bis-36: Ignoring/rejecting session description that contains unknown letter
Thread-Index: AQHVQgUPqoF/2mpvTkqSAmGVbIpoRQ==
Date: Wed, 24 Jul 2019 09:49:17 +0000
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Subject: [MMUSIC] 4566bis-36: Ignoring/rejecting session description that contains unknown letter
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Hi,

Due to my involvement in a large number of other drafts, I haven’t been able to follow the 4566bis work lately.

I do have a question.

The text says:

   “The set of type letters is deliberately small and not intended to be
   extensible -- an SDP parser MUST completely ignore or reject any
   session description that contains a type letter that it does not
   understand.”

Since the syntax does not allow new letters to begin with, why can’t an SDP parser simply discard an unknown letter if received? Why does the parser have to ignore/reject the whole session description?

Regards,

Christer

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