Chapter 23-Ultra Secure Mode
Polycom, Inc.
23-51
BFCP Over UDP – AS-SIP Content
In compliance with
UCR 2008 Change 3
,
AS-SIP
(
Assured Services-Session Initiation Protocol
)
Content
flow is an implementation of
SIP
that utilizes
SIP’s
built in security features.
When using
AS-SIP Content
, the
media line
of the content channel is not sent as part of the
initial
SDP Offer/Answer
message sequence. The
media line
of the
Content
channel is only sent
to the
MCU
when an endpoint wanting to share
Content
initiates
Content
sharing. The
Collaboration Server (RMX) then sends the
Content media line
to all conference participants
using an
SDP
Re-invite
.
Guidelines
•
AS-SIP
Content
is shared using
Multiple Resolutions (Content Transcoding)
and is not
supported in any other
Content
sharing mode such as
H.263 Content
and
H.264 Cascade
and SVC Optimized Content Protocol
.
•
Multiple Resolutions
consumes system video resources. If sufficient system video
resources are not available, a conference with
AS-SIP Content
enabled in its
Profile
, will
not be created. An error:
Conference could not be created due to lack of Content DSP
resources
,
is displayed.
•
The
SIP BFCP UDP
application line is included in
SDP Offer/Answer
message sequence.
•
An endpoint declaring
SIP BFCP TCP
is connected with
video
and
audio
but without
Content
. The
SIP BFCP TCP
channel will not be connected.
•
The following resolutions are supported with
H.264 HD Content
protocol. Only when
H.264 HD
is selected, these resolutions are enabled for selection:
—
HD 720p5
—
HD 720p30
—
HD 1080p15
•
Endpoints that do not support receiving
H.264 Content
at a resolution of
HD 720p5
or
greater are considered
Legacy Endpoints
and will receive
Content
using the people video
channel.
•
Endpoints that do not support transmitting
H.264 Content
at a resolution of
HD 720p5
or
greater are considered
Legacy Endpoints
and will transmit
Content
using the people
video channel. Depending on the endpoint type, these endpoints may not be able to
transmit
Content
at all - this is dependent on the endpoint and is not controlled by the
RMX
.
•
A mixture of older, non
AS-SIP
compliant and
AS-SIP
compliant endpoints are
supported in the same conference and are able to share
Content
.
•
An endpoint connecting during a
Content
session is immediately sent an
SDP
Re-invite
that includes the connect media line and will receive
Content
.
PREFER_IPv6
sdp-anat
appears in
SIP
headers.
Dial in:
IPv6
is the
IP Version
preference
Dial out:
IPv6
is advertised first.
Table 23-15
ANAT_IP_PROTOCOL System Flag Values for Dial in Dial out (Continued)
Value
Behavior - Dial in and Dial out
Содержание RealPresence 2000
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