[AVT] Representing Boolean MIME-type parameters in SDP?

[Ross Finlayson <finlayson at live.com>]

I recently encountered a MPEG-4 video + AMR audio RTSP/RTP session whose 
SDP lines contained the following (for the AMR audio stream):

	a=rtpmap:97 AMR/8000
...
	a=fmtp:97 octet-align

Is that last line legal?  I had thought that only the following would be legal:
	a=fmtp:97 octet-align=1

RFC 3267 (which defines the RTP payload format for AMR) defines the 
"octet-align" MIME parameter as follows:
	"octet-align: Permissible values are 0 and 1."

So, for Boolean MIME parameters like this, is it permissible to omit the 
value assignment in the SDP "a=fmtp:" line, thereby assuming the value 
1?  I had assumed not (and in fact our own RTSP client code got confused by 
the example above), but it would be nice to get some clarification of this 
question, in case examples like the one above become commonplace.

	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>


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