Polycom RMX 1500, DOC2702A manual Direct Connection to the Conference, Yes

Polycom RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide

The option “Encrypt When Possible” enables the negotiation between the MCU and the endpoints and let the MCU connect the participants according to their capabilities, where encryption is the preferred setting. Defined participants that cannot connect encrypted are

connected non-encrypted, with the exception of dial-out SIP participants.

•When the conference encryption is set to "Encrypt when possible", dial out SIP participants whose encryption is set to AUTO can only connect with encryption, otherwise they are disconnected from the conference.

•In CISCO SIP environments, dial in endpoints that are registered to CUCM can only connect as non-encrypted when the conference encryption is set to "Encrypt when possible" as the CUCM server sends the Invite command without SDP.

The same system behavior can be applied to undefined participants, depending on the setting of the System Flag

FORCE_ENCRYPTION_FOR_UNDEFINED_PARTICIPANT_IN_WHEN_AVAILABLE_MODE:

•When set to NO and the conference encryption in the Profile is set to “Encrypt When Possible”, both Encrypted and Non-encrypted undefined participants can connect to the same conferences, where encryption is the preferred setting.

•When set to YES (default), Undefined participants must connect encrypted, otherwise they are disconnected.

For defined participants, connection to the conference is decided according to the encryption settings in the conference Profile, the Defined Participant’s encryption settings.

For undefined participants, connection to the conference is decided according to the encryption settings in the conference Profile, the System Flag setting and the connecting endpoint’s Media Encryption capabilities.

Direct Connection to the Conference

Table 4-14,summarizes the connection status of participants, based on the encryption settings in the conference Profile, the Defined Participant’s encryption settings or the System Flag setting for undefined participants and the connecting endpoint’s Media Encryption

capabilities.

Table 4-14Connection of Defined and Undefined H.323, SIP and ISDN Participants to the

Conference Based on the Encryption Settings

Conference		Defined Participant		Undefined Participant
Encryption	Encryption			Connection	Connection
Setting			Connection status	Status	Status
	Setting
				*Flag = No	*Flag = YES
No	Auto		Connected,	Connected	Connected
Encryption			non-encrypted	non-encrypted	non-encrypted
				(Encryption is not	(Encryption is not
	No		Connected,
				declared by the	declared by the
			non-encrypted	RMX, therefore	RMX, therefore
	Yes		Connected only if	the endpoint does	the endpoint does
				not use	not use
			encrypted.
				encryption)	encryption)
			Non-encrypted endpoints
			are disconnected as
			encryption is forced for the
			participant.

4-42 Polycom, Inc.