how to generate barcode in vb.net 2010 Attributes in Software

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the format. The numbers are then used to index to an attribute providing more detail for the format. For example, if the session is to support audio at 16 kHz, then the entire descriptor would look like:
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m=audio 49230 RTP/AVP 99 a=rtpmap:99 L16/8000
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The preceding example indicates the session will support audio on port 49230, using the RTP/AVP transport. The attribute line provides additional details regarding the format of the audio; in this case, it is 16 kHz audio. Attributes are described in more detail in the section that follows.
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Attributes
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As mentioned, attributes serve as an extension of the SDP. In the case of media descriptions, there are a number of attributes that are defined in RFC 2327, but keep in mind that various vendors may include other proprietary attributes for their own systems use. This is perfectly acceptable and allows for more flexibility in the various entities that use SDP. The following attributes have been defined in RFC 2327:
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a=rtpmap<payload type><encoding name>/<clock rate><encoding parameters>
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The payload type of this attribute indicates whether it is audio or video. In the case of audio, there may also be encoding parameters identifying the number of voice channels, although this is optional. The encoding parameters field is not used if the payload type is video.
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a=cat:<category>
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This attribute has been suggested for use at the session description level. An application could use this to allow the receiver of a session to sort through various sessions by category. For example, in the case of streaming audio (digital radio broadcast) the category may be the genre of the music one wants to listen to.
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a=keywds:<keywords>
Keywords work a lot like the category attribute but allow for a search utility where sessions can be searched for according to specific keywords. This is also a session-level attribute.
a=tool:<name and version of tool>
This attribute is used to identify the name and the version of the tool that was used to establish a session. This is also a session-level attribute.
a=ptime:<packet time>
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This is a media description-level attribute that is used to identify in milliseconds the length of time represented in received packets for a session. This is used primarily for audio to ensure proper encoding of the audio stream.
a=rcvonly
This can be a session- or description-level attribute and is used to set the tools to receive only when receiving a session. For example, if this is to be a Webcast session, audio is received in one direction only (receivers can listen only; they cannot have a conversation with the host of the session).
a=sendrecv
This is the same as the preceding attribute, with the exception that the receiving application is set in the send and receive mode. This then enables the receiver of a session to participate in the session (bidirectional audio).
a=orient:<whiteboard orientation>
This attribute is typically used with whiteboard applications such as those used in Webinars. The three values supported are landscape, portrait, or seascape (this is upside-down landscape).
a=type:<conference type>
The conference type attribute is a session-level attribute and identifies the type of conference being established. There are several suggested values:
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a=charset:<character set>
This attribute identifies the character set that is to be used to describe the character sets used when interpreting SDP. This is necessary for international networks if a character set other than ISO 10646 is to be used.
a=sdplang:<SDP language>
This attribute identifies the language to be used within the SDP. The default is English.
a=lang:<language>
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Similar to SDP language, this allows a different language to be identified for a specific media descriptor. For example, the a=sdplang:english attribute may be found in the session description, but for a specific media description in the same session there may be a different language called out just for that medium (a=lang:spanish).
a=framerate:<frame rate>
Used for video media, this attribute identifies the maximum frame rate per second to be supported.
a=quality:<quality>
This is used to suggest a level of quality for video. There are several defined values for this field:
10 The best still-image possible 5 Default (this value does not have a quality description) 0 The worst still image quality that can be supported and is still usable
All attributes are found in either the session description or the media description levels. We have defined those found in the RFC, but remember that there can be others. Again, if an entity does not recognize an attribute, it simply ignores that attribute.
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