Polycom 3725-77601-001H manual Conference on Port is enabled, the Video Mode must be

Polycom CMA System Operations Guide

Field	Description
T120 Rate	Determines whether T.120 is enabled, and if so, the default
	transfer rate. Enable this setting when you have equipment
	that supports T.120 display of data. Options are: 6.4, 14.4,
	16, 22.4, 24, 30.4, 32, 38.4, 40, 46.4, 54.4, and 62.4.

	Note
	Because this setting uses resources on the MCU device, it
	is recommended that you select None.
Audio Algorithm	Sets the compression algorithm that the MGC uses to
	process audio.
	The default is Auto.

	Note
	Selecting a certain video/audio algorithm doesn't guarantee
	that it will be chosen for a conference since an MGC device
	may negotiate a different algorithm with the endpoints,
	depending on the endpoint’s capabilities.
Audio Mix Depth	Sets the number of participants with the loudest voices who
(sites)	can speak at once during a conference. If additional
	participants speak, their comments are not heard.
Conference on Port	When selected, this option conserves bandwidth and ports
	by putting all participants on a single port. When
	Conference on Port is enabled, the Video Mode must be
	set to one of the Continuous Presence layouts.
RMX General Settings > RMX Profile Settings
Use existing profile	Select to use an existing RMX profile.
	Clear to set all of the RMX profile settings here in the
	conference template. This method ensures that the RMX
	profile settings are the way you want them and avoids
	maintaining identical profiles on all RMX systems.

	Note
	With this option selected, conferences fail if they land on an
	RMX device and a valid RMX profile is not specified below.
RMX profile name	Identifies the RMX profile for the conference, if the
	conference is hosted on an RMX system.
	Enter the RMX profile routing name, which is generally (but
	not always) the same as the profile name as specified in the
	RMX platform.

326 Polycom, Inc.