DRAG DROP
Drag the functions that are associated with H.245 from the list on the left to the boxes on the right.

Answer:

Explanation:

H.225 is responsible only for setting up the call and routing it to the proper destination. H.225 does
not have any mechanism for exchanging capabilities or setting up and tearing down media
streams. The called H.323 device is responsible for sending the IP address and port number that
are used to establish the TCP connections for H.245 signaling. This information can be sent by the
called device in either the Alerting or Connect message. When the originating H.323 device
receives the IP address and port number for H.245 negotiations, it initiates a second TCP
connection to carry out the necessary capabilities exchange and logical channel negotiations. This
TCP session is primarily used to do four things:
Master/slave determination-This is used to resolve conflicts that might exist when two endpoints in
a call request the same thing, but only one of the two can gain access to the resource at a time.
Terminal capabilities exchange-This is one of the most important functions of the H.245 protocol.
The two most important capabilities are the supported audio codecs and the basic audio calls.
Logical channel signaling-This indicates a one-way audio stream. With H.323 version 2, it is
possible to open and close logical channels in the middle of a call. Because H.245 messages are
independent of the H.225 signaling, a call can still be connected in H.225 even if no logical

channels are open. This is typical with such features as hold, transfer, and conference.
DTMF relay-Because voice networks typically do not carry DTMF tones inband because of
compression issues, these tones are carried on the signaling channel. Ensure that the type of
DTMF relay configured on your gateway is compatible with your gatekeeper.
http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/voice_troubleshooting/old/vts_h323.html#wp106
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