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RFC 4566, "SDP: Session Description Protocol", July 2006

Note: This RFC has been obsoleted by RFC 8866

Source of RFC: mmusic (rai)

Errata ID: 2517
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT

Reported By: Victor S. Osipov
Date Reported: 2010-09-13
Held for Document Update by: Robert Sparks

Section 5.14 says:

If the <proto> sub-field is "RTP/AVP" or "RTP/SAVP" the <fmt> 
sub-fields contain RTP payload type numbers.  When a list of 
payload type numbers is given, this implies that all of these 
payload formats MAY be used in the session, but the first of these 
formats SHOULD be used as the default format for the session.

It should say:

If the <proto> sub-field is "RTP/AVP" or "RTP/SAVP" the <fmt> 
sub-fields contain RTP payload type numbers.  When a list of 
payload type numbers is given, this implies that all of these 
payload formats MAY be used in the session, and these payload 
formats are listed in order of preference, with the first format listed 
being preferred; in that case the first acceptable payload format 
from the beginning of the list SHOULD be used for the session.

Notes:

The word ‘default‘ is improper here, because payload format is not implied, but explicitly indicated. This may lead to a misunderstanding and confusion.
The corrections are proposed in order to avoid confusion and to give complete clear instructions in case of multiple payload type numbers indicated.

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