Only a selection of the most common H245 messages is described in this chapter in VS .NET

Maker Data Matrix 2d barcode in VS .NET Only a selection of the most common H245 messages is described in this chapter

Only a selection of the most common H245 messages is described in this chapter
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The Concept of Logical Channels
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H245 handles media streams through the use of logical channels A logical channel is a unidirectional media path between two endpoints Generally, in an IP environment, such a logical channel can be viewed as simply an IP address and port number supporting a particular type of media (such as G729B-encoded voice) Each logical channel has a number that is specified by the sending entity Logical channels are unidirectional, from sender to receiver Therefore, in a two-party conversation, two logical channels exist This separation allows one terminal to potentially send voice in one format and receive voice in another format Though logical channels are unidirectional, a perusal of the H245 recommendation will find mention of a bidirectional channel Such an entity is still two logical channels, though they are associated with each other To establish a media stream from one endpoint to another, the endpoint wanting to transmit information opens a logical channel The endpoint does so by sending a message to the far end, indicating the logical channel num-
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The choices of names for these groups is a little unfortunate At first glance, they have an uncanny resemblance to the service primitives request, indication, response, and confirm, as used in some SS7 applications They are not the same thing
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ber and information about the media to be sent, such as RTP payload type The message is called Open Logical Channel If the far endpoint wants to receive the media, then it responds with a positive acknowledgement (Open Logical Channel Ack) Included in the acknowledgement will be an RTP port to which the media stream should be sent The H245 messages are carried on the H245 control channel Each endpoint or gatekeeper shall establish one H245 control channel for each call in which it is participating The H245 control channel is carried on a special logical channel, channel number 0 This is a special logical channel in that it is not opened and closed like other logical channels Instead, logical channel 0 is considered permanently open as long as the endpoint is involved in a call
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H245 Procedures
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H245 includes a number of procedures For example, we have already briefly discussed the concept of opening logical channels However, several other procedures are included in H245, and some of them are briefly discussed here Before a logical channel can be opened, the sending endpoint should understand the capabilities of the receiving endpoint There is no point in trying to send voice in a format that the receiving entity cannot handle Consequently, H245 provides a procedure known as Capabilities Exchange, which involves a set of messages that can be exchanged between endpoints to inform each other of their respective capabilities Such capabilities include whether media can be sent or received (eg an endpoint might be able to receive video, but not send video), the media formats supported, and which formats can be supported simultaneously (particular combinations of voice and video) In conference calls where two or more endpoints also have an MC, a potential problem can arise as to who is in control of the conference Equally, imagine a situation where two endpoints have an urgent need to communicate with each other and both try to start a session with the other at the same time To resolve these situations, H245 has a procedure for master-slave determination Just because an endpoint can handle media in a particular format, it may have a preference for one format over another Although capability exchange enables one endpoint to indicate to another which types of media it is able to handle, the Request Mode procedure enables an endpoint to rank formats in order of preference
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