camera
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... SDP-based systems to
use far-end camera control, end to end, without any protocol
translation in the middle.
...
... ITU.H224]. The far-end
camera control protocol (FECC) is internal to the H.224 frame and is
identified by the client ...
... RFC4566] parameters needed to
support the above far-end camera control protocol in systems that use
SDP ...
... RTP packets from the H.224 packets.
Using far end camera control protocol in point-to-point calls and
...
... Terminals sending simple far-end camera control commands should
use this MIME type. Receivers ...
...
Far-end camera control communication is uni-directional. H.224 is
bi-directional and can be used to learn the capabilities of the
...
... bi-directional and can be used to learn the capabilities of the
remote video end point, e.g., how many cameras it has. The offer
answer exchange is dependent on the functionality of both sides.
...
...
The offerer offers a sendonly channel if its camera cannot be
remotely controlled and if the offerer does not intend to use H.224
to learn the capabilities of the remote video endpoints ...
... endpoints.
In all other cases, when the offerer's camera can be remotely
controlled and/or it intends to use H.224 capabilities negotiation,
...
... If it receives an offer with sendonly, it answers with a recvonly if
it supports far-end camera control; otherwise, it ignores/rejects the
offer.
...
... offer.
If it receives an offer with sendrecv and its camera can be remotely
controlled, or it intends to use H.224 capabilities negotiation, it
...
... controlled, or it intends to use H.224 capabilities negotiation, it
answers with a sendrecv option. If its camera cannot be remotely
controlled, it can answer with a sendonly attribute. The answerer
may also reject the offer if he does not support FECC or does not
...
... A potential denial-of-service threat exists for data that causes
application behavior like camera movement. The attacker can inject
...
... stream that cause the receiver to
change the camera position. Therefore, the usage of data origin
authentication and data integrity protection of at least the H.323 ...
... International Telecommunications Union, "A far end camera control protocol for videoconferences using H.224", ITU- T Recommendation H.281, November 1994. ...