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Re: [MMUSIC] Progressing draft-garcia-mmusic-sdp-cs-01
The problem with using "-" for the port number is that it isn't allowed
by the syntax of SDP. From 4566:
media-descriptions = *( media-field
information-field
*connection-field
bandwidth-fields
key-field
attribute-fields )
media-field = %x6d "=" media SP port ["/" integer]
SP proto 1*(SP fmt) CRLF
port = 1*DIGIT
So unless you want to ammend 4566 you can't use "-" in the port field.
While 9 doesn't mean "not applicable", it is still a good choice in a
case where the port number is irrelevant, because it doesn't conflict
with any "real" port. This is the same logic that led to it being used
in comedia.
Thanks,
Paul
Miguel A. Garcia wrote:
Take a look at the IANA registry of port numbers, port number 9:
discard 9/tcp Discard
discard 9/udp Discard
# Jon Postel <postel&isi.edu>
discard 9/sctp Discard
Discard does not mean "not applicable" in my opinion.
/Miguel
Christer Holmberg wrote:
Well, I would say that port 9 means "do not care about this port" :)
But, I guess it is a matter of taste.
Im my understanding, port 9 means port 9, as transport protocol port
number 0x0009. In the one particular case of COMEDIA, _if_ the setup
is _passive_, then the port number is ignored, and value 9 is used as
a syntactical placeholder.
No?
If you say so :) I guess you're right.
Regards,
Christer
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The problem with using "-" for the port number is that it isn't allowed
by the syntax of SDP. From 4566:
media-descriptions = *( media-field
information-field
*connection-field
bandwidth-fields
key-field
attribute-fields )
media-field = %x6d "=" media SP port ["/" integer]
SP proto 1*(SP fmt) CRLF
port = 1*DIGIT
So unless you want to ammend 4566 you can't use "-" in the port field.
While 9 doesn't mean "not applicable", it is still a good choice in a
case where the port number is irrelevant, because it doesn't conflict
with any "real" port. This is the same logic that led to it being used
in comedia.
Thanks,
Paul
Miguel A. Garcia wrote:
Take a look at the IANA registry of port numbers, port number 9:
discard 9/tcp Discard
discard 9/udp Discard
# Jon Postel <postel&isi.edu>
discard 9/sctp Discard
Discard does not mean "not applicable" in my opinion.
/Miguel
Christer Holmberg wrote:
Well, I would say that port 9 means "do not care about this port" :)
But, I guess it is a matter of taste.
Im my understanding, port 9 means port 9, as transport protocol port
number 0x0009. In the one particular case of COMEDIA, _if_ the setup
is _passive_, then the port number is ignored, and value 9 is used as
a syntactical placeholder.
No?
If you say so :) I guess you're right.
Regards,
Christer
_______________________________________________
mmusic mailing list
mmusic at ietf.org
https://www.ietf.org/mailman/listinfo/mmusic
_______________________________________________
mmusic mailing list
mmusic at ietf.org
https://www.ietf.org/mailman/listinfo/mmusic